初中数学2次函数应用题

初中数学2次函数应用题 1.利达经销店为某工厂代销一种建筑材料(这里的代销是指厂家先免费提供货源，待货物售出后再进行结算，未售出的由厂家负责处理)(当每吨售价为260元时，月销售量为45吨(该经销店为提高经营利润，准备采取降价的方式进行促销(经市场调查发现:当每吨售价下降10元时，月销售量就会增加7.5吨(综合考虑各种因素,每售出一吨建筑材料共需支付厂家及其它费用100元,设每吨材料售价为x元,该经销店的月利润为y元( (1)当每吨售价为240元时，计算此时的月销售量; (2)求y与x的函数关系式(不要求写出x的取值范围); (3)该经销店要获得最大月利润，售价应定为每吨多少元, (4)小静说:“当月利润最大时，月销售额也最大(”你认为对吗,请说明理由( 2.(2010德州)为迎接第四届世界太阳城大会，德州市把主要路段路灯更换为太阳能路灯(已知太阳能路灯售价为5000元/个，目前两个商家有此产品(甲商家用如下方法促销:若购买路灯不超过100个，按原价付款;若一次购买100个以上，且购买的个数每增加一个，其价格减少10元，但太阳能路灯的售价不得低于3500元/个(乙店一律按原价的80?销售(现购买太阳能路灯x个，如果全部在甲商家购买，则所需金额为y元;如果全部在乙商家购1 买，则所需金额为y元. 2 (1)分别求出y、y与x之间的函数关系式; 12 (2)若市政府投资140万元，最多能购买多少个太阳能路灯, welding procedures of steel pressure vessel NDT 9 JB/T4744-2000 steel pressure vessel products mechanical properties test of welded plate II, mechanical equipment installation engineering 1 GB150-98 2 GB50128-2005 vertical cylindrical steel pressure vessel steel welded specification for construction and acceptance of oil tank 3 JB/ T4735-1997 steel welded atmospheric pressure vessel 4 GB50231-2009 mechanical equipment installation engineering construction and acceptance specification for 5 GB50275-98 compressor, fan and pump installation engineering construction and acceptance specification for lifting 6 HG20201-2000 construction installation engineering construction standard 7, HG ... Pressure gauges, using an installed spark arrestor for acetylene cylinders, illegal carrying, using gas cylinders, each operator fined 20 Yuan. Gas bottle without the hot sun exposure measures, responsibilities of team a fine of 50 Yuan. (7) at height and the opening and provisional protective measures have been taken, the responsible unit fined 200 Yuan, construction person in charge a fine of 50 Yuan. (8) no permit to work and the job in accordance with the provisions, on the job unit fined 300 yuan, the unit will charge a fine of 100 Yuan. 7.5.3 accident penalties (1) injuries fatalities directly punished 1~2 million. Direct responsibility for the accident and have the corresponding responsibility of leadership, such as concerning administrative sanctions, should be brought to the company or the relevant Department. (2) personal injury accident occurred, the direct punishment 0.5-10,000 yuan, responsible for the direct responsibility for the accident and the responsibility of leadership, such as concerning administrative sanctions should be dealt with by the personnel Department of the company. (3) personal injury 3.(2010恩施)恩施州绿色、富硒产品和特色农产品在国际市场上颇具竞争力，其中香菇 远销日本和韩国等地(上市时，外商李经理按市场价格10元/千克在我州收购了2000千克 香菇存放入冷库中(据预测，香菇的市场价格每天每千克将上涨0.5元，但冷库存放这批香 菇时每天需要支出各种费用合计340元，而且香菇在冷库中最多保存110天，同时，平均每 天有6千克的香菇损坏不能出售( (1)若存放天后，将这批香菇一次性出售，设这批香菇的销售总金额为元，试写出与xyy之间的函数关系式( x (2)李经理想获得利润22500元，需将这批香菇存放多少天后出售,(利润,销售总金额,收购成本,各种费用) (3)李经理将这批香菇存放多少天后出售可获得最大利润,最大利润是多少, 4(2010河北)某公司销售一种新型节能产品，现准备从国内和国外两种销售方案中选择一种进行销售( 1若只在国内销售，销售价格y(元/件)与月销量x(件)的函数关系式为y =x，150， ,100成本为20元/件，无论销售多少，每月还需支出广告费62500元，设月利润为w(元)内(利润 = 销售额,成本,广告费)( 若只在国外销售，销售价格为150元/件，受各种不确定因素影响，成本为a元/件(a为 12常数，10?a?40)，当月销量为x(件)时，每月还需缴纳x 元的附加费，设月利润为100 w(元)(利润 = 销售额,成本,附加费)( 外 (1)当x = 1000时，y = 元/件，w= 元; 内 (2)分别求出w，w与x间的函数关系式(不必写x的取值范围); 内外 (3)当x为何值时，在国内销售的月利润最大,若在国外销售月利润的最大值与在国内销售月利润的最大值相同，求a的值; (4)如果某月要将5000件产品全部销售完，请你通过分析帮公司决策，选择在国内还是在国外销售才能使所获月利润较大, 2bacb4,2参考公式:抛物线的顶点坐标是( yaxbxca,，，,(0)(,),24aa -.5, should be brought to the company or the relevant Department. (2) personal injury accident occurred, the direct punishment 0ctionsesponsibility for the accident and have the corresponding responsibility of leadership, such as concerning administrative sanunit will charge a fine of 100 Yuan. 7.5.3 accident penalties (1) injuries fatalities directly punished 1~2 million. Direct r, the charge a fine of 50 Yuan. (8) no permit to work and the job in accordance with the provisions, on the job unit fined 300 yuanthe opening and provisional protective measures have been taken, the responsible unit fined 200 Yuan, construction person in t and tor fined 20 Yuan. Gas bottle without the hot sun exposure measures, responsibilities of team a fine of 50 Yuan. (7) at heighPressure gauges, using an installed spark arrestor for acetylene cylinders, illegal carrying, using gas cylinders, each opera2000 construction installation engineering construction standard 7, HG ... -98 compressor, fan and pump installation engineering construction and acceptance specification for lifting 6 HG20201-neering construction and acceptance specification for 5 GB502752009 mechanical equipment installation engi-1997 steel welded atmospheric pressure vessel 4 GB50231-T47352005 vertical cylindrical steel pressure vessel steel welded specification for construction and acceptance of oil tank 3 JB/ -98 2 GB50128-ring 1 GB1502000 steel pressure vessel products mechanical properties test of welded plate II, mechanical equipment installation enginee-welding procedures of steel pressure vessel NDT 9 JB/T4744administrative sanctions should be dealt with by the personnel Department of the company. (3) personal injury ing10,000 yuan, responsible for the direct responsibility for the accident and the responsibility of leadership, such as concern2 5.某食品零售店为仪器厂代销一种面包，未售出的面包可退回厂家，以统计销售情况发现，当这种面包的单价定为7角时，每天卖出160个(在此基础上，这种面包的单价每提高1角时，该零售店每天就会少卖出20个(考虑了所有因素后该零售店每个面包的成本是5角(设这种面包的单价为x(角)，零售店每天销售这种面包所获得的利润为y(角)( ?用含x的代数式分别 表 关于同志近三年现实表现材料材料类招标技术评分表图表与交易pdf视力表打印pdf用图表说话 pdf 示出每个面包的利润与卖出的面包个数; ?求y与x之间的函数关系式; ?当面包单价定为多少时，该零售店每天销售这种面包获得的利润最大,最大利润为多少, 6.(2010贵阳)某商场以每件50元的价格购进一种商品，销售中发现这种商品每天的销售量m(件)与每件的销售价x(元)满足一次函数，其图象如图所示. (1)每天的销售数量m(件)与每件的销售价格x(元) 的函数表达式是 ((3分) (2)求该商场每天销售这种商品的销售利润y(元)与每件的销售价格x(元)之间的函数表达式;(4分) (3)每件商品的销售价格在什么范围内，每天的销售利润随着销售价格的提高而增加?(3分) 98 compressor, fan and pump installation engineering construction and acceptance specification for lifting 6 HG20201-2009 mechanical equipment installation engineering construction and acceptance specification for 5 GB50275-502311997 steel welded atmospheric pressure vessel 4 GB-T47352005 vertical cylindrical steel pressure vessel steel welded specification for construction and acceptance of oil tank 3 JB/ -98 2 GB50128-ate II, mechanical equipment installation engineering 1 GB1502000 steel pressure vessel products mechanical properties test of welded pl-welding procedures of steel pressure vessel NDT 9 JB/T4744the company. (3) personal injury responsibility of leadership, such as concerning administrative sanctions should be dealt with by the personnel Department of 10,000 yuan, responsible for the direct responsibility for the accident and the-injury accident occurred, the direct punishment 0.5ship, such as concerning administrative sanctions, should be brought to the company or the relevant Department. (2) personal eadertalities directly punished 1~2 million. Direct responsibility for the accident and have the corresponding responsibility of lprovisions, on the job unit fined 300 yuan, the unit will charge a fine of 100 Yuan. 7.5.3 accident penalties (1) injuries fa th theible unit fined 200 Yuan, construction person in charge a fine of 50 Yuan. (8) no permit to work and the job in accordance wiies of team a fine of 50 Yuan. (7) at height and the opening and provisional protective measures have been taken, the responsibilitillegal carrying, using gas cylinders, each operator fined 20 Yuan. Gas bottle without the hot sun exposure measures, responstion engineering construction standard 7, HG ... Pressure gauges, using an installed spark arrestor for acetylene cylinders, 2000 construction installa-3 7.(,,,,荆州)国家推行“节能减排，低碳经济”政策后，某环保节能设备生产企业的产品供不应求(若该企业的某种环保设备每月的产量保持在一定的范围，每套产品的生产成本不高于50万元，每套产品的售价不低于90万元(已知这种设备的月产量x(套)与每套的售价(万元)之间满足关系式，月产量x(套)与生产总成本(万元)yyy,170,2x121 存在如图所示的函数关系. (1)直接写出与x之间的函数关系式; y2(((( (2)求月产量x的范围; (3)当月产量x(套)为多少时， 这种设备的利润W(万元)最大,最大利润是多少, 8.(2010青岛)某市政府大力扶持大学生创业(李明在政府的扶持下投资销售一种进价为每件20元的护眼台灯(销售过程中发现，每月销售量y(件)与销售单价x(元)之间的关系 yx,,，10500可近似的看作一次函数:( (1)设李明每月获得利润为w(元)，当销售单价定为多少元时，每月可获得最大利润, (2)如果李明想要每月获得2000元的利润，那么销售单价应定为多少元, (3)根据物价部门规定，这种护眼台灯的销售单价不得高于32元，如果李明想要每月获得的利润不低于2000元，那么他每月的成本最少需要多少元,(成本,进价×销售量) Pressure gauges, using an installed spark arrestor for acetylene cylinders, illegal carrying, using gas cylinders, each opera2000 construction installation engineering construction standard 7, HG ... -98 compressor, fan and pump installation engineering construction and acceptance specification for lifting 6 HG20201-neering construction and acceptance specification for 5 GB502752009 mechanical equipment installation engi-1997 steel welded atmospheric pressure vessel 4 GB50231-T47352005 vertical cylindrical steel pressure vessel steel welded specification for construction and acceptance of oil tank 3 JB/ -98 2 GB50128-ring 1 GB1502000 steel pressure vessel products mechanical properties test of welded plate II, mechanical equipment installation enginee-welding procedures of steel pressure vessel NDT 9 JB/T4744administrative sanctions should be dealt with by the personnel Department of the company. (3) personal injury ing10,000 yuan, responsible for the direct responsibility for the accident and the responsibility of leadership, such as concern-.5, should be brought to the company or the relevant Department. (2) personal injury accident occurred, the direct punishment 0ctionsesponsibility for the accident and have the corresponding responsibility of leadership, such as concerning administrative sanunit will charge a fine of 100 Yuan. 7.5.3 accident penalties (1) injuries fatalities directly punished 1~2 million. Direct r, the charge a fine of 50 Yuan. (8) no permit to work and the job in accordance with the provisions, on the job unit fined 300 yuanthe opening and provisional protective measures have been taken, the responsible unit fined 200 Yuan, construction person in t and tor fined 20 Yuan. Gas bottle without the hot sun exposure measures, responsibilities of team a fine of 50 Yuan. (7) at heigh4 9、(2009烟台市)某商场将进价为2000元的冰箱以2400元售出，平均每天能售出8台，为了配合国家“家电下乡”政策的实施，商场决定采取适当的降价措施.调查表明:这种冰箱的售价每降低50元，平均每天就能多售出4台( (1)假设每台冰箱降价x元，商场每天销售这种冰箱的利润是y元，请写出y与x之间的函数表达式;(不要求写自变量的取值范围) (2)商场要想在这种冰箱销售中每天盈利4800元，同时又要使百姓得到实惠，每台冰箱应降价多少元, (3)每台冰箱降价多少元时，商场每天销售这种冰箱的利润最高,最高利润是多少, 某商品的进价为每件40元，售价为每件50元，每个月可卖出210件;如10、(2009武汉) 果每件商品的售价每上涨1元，则每个月少卖10件(每件售价不能高于65元)(设每件商品的售价上涨元(为正整数)，每个月的销售利润为元( xxy (1)求与的函数关系式并直接写出自变量的取值范围; xxy (2)每件商品的售价定为多少元时，每个月可获得最大利润,最大的月利润是多少元, (3)每件商品的售价定为多少元时，每个月的利润恰为2200元,根据以上结论，请你直接 写出售价在什么范围时，每个月的利润不低于2200元, illegal carrying, using gas cylinders, each operator fined 20 Yuan. Gas bottle without the hot sun exposure measures, responstion engineering construction standard 7, HG ... Pressure gauges, using an installed spark arrestor for acetylene cylinders, 2000 construction installa-98 compressor, fan and pump installation engineering construction and acceptance specification for lifting 6 HG20201-2009 mechanical equipment installation engineering construction and acceptance specification for 5 GB50275-502311997 steel welded atmospheric pressure vessel 4 GB-T47352005 vertical cylindrical steel pressure vessel steel welded specification for construction and acceptance of oil tank 3 JB/ -98 2 GB50128-ate II, mechanical equipment installation engineering 1 GB1502000 steel pressure vessel products mechanical properties test of welded pl-welding procedures of steel pressure vessel NDT 9 JB/T4744the company. (3) personal injury responsibility of leadership, such as concerning administrative sanctions should be dealt with by the personnel Department of 10,000 yuan, responsible for the direct responsibility for the accident and the-injury accident occurred, the direct punishment 0.5ship, such as concerning administrative sanctions, should be brought to the company or the relevant Department. (2) personal eadertalities directly punished 1~2 million. Direct responsibility for the accident and have the corresponding responsibility of lprovisions, on the job unit fined 300 yuan, the unit will charge a fine of 100 Yuan. 7.5.3 accident penalties (1) injuries fa th theible unit fined 200 Yuan, construction person in charge a fine of 50 Yuan. (8) no permit to work and the job in accordance wiies of team a fine of 50 Yuan. (7) at height and the opening and provisional protective measures have been taken, the responsibilit5 11. (2009年重庆市江津区)某商场在销售旺季临近时 ，某品牌的童装销售价格呈上升趋势，假如这种童装开始时的售价为每件20元，并且每周(7天)涨价2元，从第6周开始，保持每件30元的稳定价格销售，直到11周结束，该童装不再销售。 (1)请建立销售价格y(元)与周次x之间的函数关系; (2)若该品牌童装于进货当周售完，且这种童装每件进价z(元)与周次x之间的关系为 12， 1? x ?11，且x为整数，那么该品牌童装在第几周售出后，每z,,(x,8)，128 件获得利润最大,并求最大利润为多少, 12、(2009年茂名市)茂名石化乙烯厂某车间生产甲、乙两种塑料的相关信息如下表，请你解答下列问题: 价 出厂价 成本价 排污处理费 目 品 种 甲种塑料 2100(元/吨) 800(元/吨) 200(元/吨) 100(元/吨) 每月还需支付设备管理、 乙种塑料 2400(元/吨) 1100(元/吨) 维护费20000元 yyy (1)设该车间每月生产甲、乙两种塑料各x吨，利润分别为元和元，分别求和121 y 与x的函数关系式(注:利润=总收入-总支出);(6分) 2 (2)已知该车间每月生产甲、乙两种塑料均不超过400吨，若某月要生产甲、乙两种塑 料共700吨，求该月生产甲、乙塑料各多少吨，获得的总利润最大,最大利润是多 少,(4分) ctionsesponsibility for the accident and have the corresponding responsibility of leadership, such as concerning administrative sanunit will charge a fine of 100 Yuan. 7.5.3 accident penalties (1) injuries fatalities directly punished 1~2 million. Direct r, the charge a fine of 50 Yuan. (8) no permit to work and the job in accordance with the provisions, on the job unit fined 300 yuanthe opening and provisional protective measures have been taken, the responsible unit fined 200 Yuan, construction person in t and tor fined 20 Yuan. Gas bottle without the hot sun exposure measures, responsibilities of team a fine of 50 Yuan. (7) at heighPressure gauges, using an installed spark arrestor for acetylene cylinders, illegal carrying, using gas cylinders, each opera2000 construction installation engineering construction standard 7, HG ... -98 compressor, fan and pump installation engineering construction and acceptance specification for lifting 6 HG20201-neering construction and acceptance specification for 5 GB502752009 mechanical equipment installation engi-1997 steel welded atmospheric pressure vessel 4 GB50231-T47352005 vertical cylindrical steel pressure vessel steel welded specification for construction and acceptance of oil tank 3 JB/ -98 2 GB50128-ring 1 GB1502000 steel pressure vessel products mechanical properties test of welded plate II, mechanical equipment installation enginee-welding procedures of steel pressure vessel NDT 9 JB/T4744administrative sanctions should be dealt with by the personnel Department of the company. (3) personal injury ing10,000 yuan, responsible for the direct responsibility for the accident and the responsibility of leadership, such as concern-.5, should be brought to the company or the relevant Department. (2) personal injury accident occurred, the direct punishment 06 13((2009年黄石市)为了扩大内需，让惠于农民，丰富农民的业余生活，鼓励送彩电下乡，国家决定对购买彩电的农户实行政府补贴(规定每购买一台彩电，政府补贴若干元，经调查某商场销售彩电台数(台)与补贴款额(元)之间大致满足如图?所示的一次函数关系(随xy 着补贴款额的不断增大，销售量也不断增加，但每台彩电的收益(元)会相应降低且xZZ与之间也大致满足如图?所示的一次函数关系( x z(元) y(台) 200 160 1200 800 200 x(元) 0 400 0 x(元) 图? 图? (1)在政府未出台补贴措施前，该商场销售彩电的总收益额为多少元, (2)在政府补贴政策实施后，分别求出该商场销售彩电台数和每台家电的收益与政府yZ补贴款额之间的函数关系式; x (3)要使该商场销售彩电的总收益(元)最大，政府应将每台补贴款额定为多少,并wx求出总收益的最大值( w 14(宏志中学九年级300名同学毕业前夕给灾区90名同学捐赠了一批学习用品(书包和文具盒)，由于零花钱有限，每6人合买一个书包，每2人合买一个文具盒(每个同学都只参加一件学习用品的购买)，书包和文具盒的单价分别是54元和12元( (1)若有x名同学参加购买书包，试求出购买学习用品的总件数y与x之间的函数关系式 (不要求写出自变量的取值范围); (2)若捐赠学习用品总金额超过了2300元，且灾区90名同学每人至少得到了一件学习 用品，请问同学们如何安排购买书包和文具盒的人数,此时选择其中哪种方案，使 购买学习用品的总件数最多, th theible unit fined 200 Yuan, construction person in charge a fine of 50 Yuan. (8) no permit to work and the job in accordance wiies of team a fine of 50 Yuan. (7) at height and the opening and provisional protective measures have been taken, the responsibilitillegal carrying, using gas cylinders, each operator fined 20 Yuan. Gas bottle without the hot sun exposure measures, responstion engineering construction standard 7, HG ... Pressure gauges, using an installed spark arrestor for acetylene cylinders, 2000 construction installa-98 compressor, fan and pump installation engineering construction and acceptance specification for lifting 6 HG20201-2009 mechanical equipment installation engineering construction and acceptance specification for 5 GB50275-502311997 steel welded atmospheric pressure vessel 4 GB-T47352005 vertical cylindrical steel pressure vessel steel welded specification for construction and acceptance of oil tank 3 JB/ -98 2 GB50128-ate II, mechanical equipment installation engineering 1 GB1502000 steel pressure vessel products mechanical properties test of welded pl-welding procedures of steel pressure vessel NDT 9 JB/T4744the company. (3) personal injury responsibility of leadership, such as concerning administrative sanctions should be dealt with by the personnel Department of 10,000 yuan, responsible for the direct responsibility for the accident and the-injury accident occurred, the direct punishment 0.5ship, such as concerning administrative sanctions, should be brought to the company or the relevant Department. (2) personal eadertalities directly punished 1~2 million. Direct responsibility for the accident and have the corresponding responsibility of lprovisions, on the job unit fined 300 yuan, the unit will charge a fine of 100 Yuan. 7.5.3 accident penalties (1) injuries fa 7 15.一快餐店试销某种套餐，试销一段时间后发现，每份套餐的成本为5元，该店每天固定支出费用为600元(不含套餐成本)(若每份售价不超过10元，每天可销售400份;若每份售价超过10元，每提高1元，每天的销售量就减少40份(为了便于结算，每份套餐的售价x(元)取整数，用y(元)表示该店日净收入((日净收入,每天的销售额,套餐成本,每天固定(( 支出) (1)求y与x的函数关系式; (2)若每份套餐售价不超过10元，要使该店日净收入不少于800元，那么每份售价最少 不低于多少元, (3)该店既要吸引顾客，使每天销售量较大，又要有较高的日净收入(按此要求，每份套 餐的售价应定为多少元,此时日净收入为多少, 16.已知某种水果的批发单价与批发量的函数关系如图(1)所示( (1)请说明图中?、?两段函数图象的实际意义( 批发单价(元) ? 5 ? 4 20 60 O 批发量(kg) (2)写出批发该种水果的资金金额w(元)与批发量m(kg)之间的 函数关系式;在下图的坐标系中画出该函数图象;指出金额在什 么范围内，以同样的资金可以批发到较多数量的该种水果( (3)经调查，某经销商销售该种水果的日最高销量与零售价之间的函 数关系如图(2)所示，该经销商拟每日售出60kg以上该种水果， 且当日零售价不变，请你帮助该经销商 设计 领导形象设计圆作业设计ao工艺污水处理厂设计附属工程施工组织设计清扫机器人结构设计 进货和销售的方案， 使得当日获得的利润最大( tor fined 20 Yuan. Gas bottle without the hot sun exposure measures, responsibilities of team a fine of 50 Yuan. (7) at heighPressure gauges, using an installed spark arrestor for acetylene cylinders, illegal carrying, using gas cylinders, each opera2000 construction installation engineering construction standard 7, HG ... -98 compressor, fan and pump installation engineering construction and acceptance specification for lifting 6 HG20201-neering construction and acceptance specification for 5 GB502752009 mechanical equipment installation engi-1997 steel welded atmospheric pressure vessel 4 GB50231-T47352005 vertical cylindrical steel pressure vessel steel welded specification for construction and acceptance of oil tank 3 JB/ -98 2 GB50128-ring 1 GB1502000 steel pressure vessel products mechanical properties test of welded plate II, mechanical equipment installation enginee-welding procedures of steel pressure vessel NDT 9 JB/T4744administrative sanctions should be dealt with by the personnel Department of the company. (3) personal injury ing10,000 yuan, responsible for the direct responsibility for the accident and the responsibility of leadership, such as concern-.5, should be brought to the company or the relevant Department. (2) personal injury accident occurred, the direct punishment 0ctionsesponsibility for the accident and have the corresponding responsibility of leadership, such as concerning administrative sanunit will charge a fine of 100 Yuan. 7.5.3 accident penalties (1) injuries fatalities directly punished 1~2 million. Direct r, the charge a fine of 50 Yuan. (8) no permit to work and the job in accordance with the provisions, on the job unit fined 300 yuanthe opening and provisional protective measures have been taken, the responsible unit fined 200 Yuan, construction person in t and 8 金额w(元) 日最高销量(kg) 80 (6，80) 300 200 40 (7，40) 100 O O 2 4 6 8 20 40 60 零售价(元) 批发量m(kg) 17.丹东市“建设社会主义新农村”工作组到东港市大棚蔬菜生产基地指导菜农修建大棚种植蔬菜。通过调查得知:平均修建每公顷大棚要用支架、农膜等材料费2.7万元;购置滴灌装置，这项费用(万元)与大棚面积(公顷)的平方成正比，比例系数为0.9;另外每公顷种植蔬菜需要种子、化肥、农药等开支0.3万元。每公顷蔬菜平均可卖7.5万元。 (1)基地的菜农共修建大棚x(公顷)，当年收益(扣除修建和种植成本后)为y(万元),写出y关于x的函数关系式。 (2)若某菜农期望通过种植大棚蔬菜当年获利5万元收益，工作组应建议他修建多少公顷大棚,(用分数表示即可) (3)除种子、化肥、农药投资只能当年收益外，其他设施3年内不需增加投资仍可继续使用。如果按三年计算，是否大棚面积越大收益越大,修建面积为多少是可以获得最大利润, 条合理化建议。请帮工作组为基地修建大棚提一 illegal carrying, using gas cylinders, each operator fined 20 Yuan. Gas bottle without the hot sun exposure measures, responstion engineering construction standard 7, HG ... Pressure gauges, using an installed spark arrestor for acetylene cylinders, 2000 construction installa-98 compressor, fan and pump installation engineering construction and acceptance specification for lifting 6 HG20201-2009 mechanical equipment installation engineering construction and acceptance specification for 5 GB50275-502311997 steel welded atmospheric pressure vessel 4 GB-T47352005 vertical cylindrical steel pressure vessel steel welded specification for construction and acceptance of oil tank 3 JB/ -98 2 GB50128-ate II, mechanical equipment installation engineering 1 GB1502000 steel pressure vessel products mechanical properties test of welded pl-welding procedures of steel pressure vessel NDT 9 JB/T4744the company. (3) personal injury responsibility of leadership, such as concerning administrative sanctions should be dealt with by the personnel Department of 10,000 yuan, responsible for the direct responsibility for the accident and the-injury accident occurred, the direct punishment 0.5ship, such as concerning administrative sanctions, should be brought to the company or the relevant Department. (2) personal eadertalities directly punished 1~2 million. Direct responsibility for the accident and have the corresponding responsibility of lprovisions, on the job unit fined 300 yuan, the unit will charge a fine of 100 Yuan. 7.5.3 accident penalties (1) injuries fa th theible unit fined 200 Yuan, construction person in charge a fine of 50 Yuan. (8) no permit to work and the job in accordance wiies of team a fine of 50 Yuan. (7) at height and the opening and provisional protective measures have been taken, the responsibilit9 18(今年我国多个省市遭受严重干旱，受旱灾的影响，4月份，我市某蔬菜价格呈上升趋势，其前四周每周的平均销售价格变化如下表: 周数x 1 2 3 4 价格y(元/千克) 2 2.2 2.4 2.6 进入5月，由于本地蔬菜的上市，此种蔬菜的平均销售价格y(元/千克)从5月第1 周的2.8元/千克下降至第2周的2.4元/千克，且y与周数x的变化情况满足二次函数 1 2y,, x，bx，c. 20 (1)请观察题中的表格，用所学过的一次函数、反比例函数或二次函数的有关知识直接写 出4月份y与x 的函数关系式，并求出5月份y与x的函数关系式; 1 (2)若4月份此种蔬菜的进价m(元/千克)与周数x所满足的函数关系为m, x，1.2， 4 1,5月份此种蔬菜的进价m(元/千克)与周数x所满足的函数关系为m,x，2(试5 问4月份与5月份分别在哪一周销售此种蔬菜一千克的利润最大,且最大利润分别是 多少, (3)若5月份的第2周共销售100吨此种蔬菜(从5月份的第3周起，由于受暴雨的影响， 此种蔬菜的可供销量将在第2周销量的基础上每周减少a %，政府为稳定蔬菜价格， 从外地调运2吨此种蔬菜，刚好满足本地市民的需要，且使此种蔬菜的销售价格比第 2周仅上涨0.8 a %(若在这一举措下，此种蔬菜在第3周的总销售额与第2周刚好持 平，请你参考以下数据，通过计算估算出a的整数值( 22222(参考数据:37,1369，38,1444，39,1521，40,1600，41,1681) 19.如图所示(某校 计划 项目进度计划表范例计划下载计划下载计划下载课程教学计划下载 将一块形状为锐角三角形ABC的空地进行生态环境改造(已知?ABC的边BC长120米，高AD长80米。学校计划将它分割成?AHG、?BHE、?GFC和矩形EFGH四部分(如图)。其中矩形EFGH的一边EF在边BC上(其余两个顶点H、G分别在边AB、AC上。现计划在?AHG上种草，每平方米投资6元;在?BHE、?FCG上都种花，每平方米投资10元;在矩形EFGH上兴建爱心鱼池，每平方米投资4元。 (1)当FG长为多少米时，种草的面积与种花的面积相等, (2)当矩形EFGH的边FG为多少米时，?ABC空地改造总投资最小,最小值为多少, tor fined 20 Yuan. Gas bottle without the hot sun exposure measures, responsibilities of team a fine of 50 Yuan. (7) at heighPressure gauges, using an installed spark arrestor for acetylene cylinders, illegal carrying, using gas cylinders, each opera2000 construction installation engineering construction standard 7, HG ... -98 compressor, fan and pump installation engineering construction and acceptance specification for lifting 6 HG20201-neering construction and acceptance specification for 5 GB502752009 mechanical equipment installation engi-1997 steel welded atmospheric pressure vessel 4 GB50231-T47352005 vertical cylindrical steel pressure vessel steel welded specification for construction and acceptance of oil tank 3 JB/ -98 2 GB50128-ring 1 GB1502000 steel pressure vessel products mechanical properties test of welded plate II, mechanical equipment installation enginee-welding procedures of steel pressure vessel NDT 9 JB/T4744administrative sanctions should be dealt with by the personnel Department of the company. (3) personal injury ing10,000 yuan, responsible for the direct responsibility for the accident and the responsibility of leadership, such as concern-.5, should be brought to the company or the relevant Department. (2) personal injury accident occurred, the direct punishment 0ctionsesponsibility for the accident and have the corresponding responsibility of leadership, such as concerning administrative sanunit will charge a fine of 100 Yuan. 7.5.3 accident penalties (1) injuries fatalities directly punished 1~2 million. Direct r, the charge a fine of 50 Yuan. (8) no permit to work and the job in accordance with the provisions, on the job unit fined 300 yuanthe opening and provisional protective measures have been taken, the responsible unit fined 200 Yuan, construction person in t and 10 20.某水产品养殖企业为指导该企业某种水产品的养殖和销售，对历年市场行情和水产品养 殖情况进行了调查(调查发现这种水产品的每千克售价(元)与销售月份(月)满足yx1 3关系式，而其每千克成本(元)与销售月份(月)满足的函数关系如图yx,,，36yx28 所示( bc、(1)试确定的值; (2)求出这种水产品每千克的利润(元)与销售月份(月)之间的函数关系式; xy (3)“五?一”之前，几月份出售这种水产品每千克的利润最大,最大利润是多少, y(元) 2 1 2 yxbxc,，，28 25 24 O 1 2 3 4 5 6 7 8 9 10 11 12 x(月) 第20题图 -98 compressor, fan and pump installation engineering construction and acceptance specification for lifting 6 HG20201-2009 mechanical equipment installation engineering construction and acceptance specification for 5 GB50275-502311997 steel welded atmospheric pressure vessel 4 GB-T47352005 vertical cylindrical steel pressure vessel steel welded specification for construction and acceptance of oil tank 3 JB/ -98 2 GB50128-ate II, mechanical equipment installation engineering 1 GB1502000 steel pressure vessel products mechanical properties test of welded pl-welding procedures of steel pressure vessel NDT 9 JB/T4744the company. (3) personal injury responsibility of leadership, such as concerning administrative sanctions should be dealt with by the personnel Department of 10,000 yuan, responsible for the direct responsibility for the accident and the-injury accident occurred, the direct punishment 0.5ship, such as concerning administrative sanctions, should be brought to the company or the relevant Department. (2) personal eadertalities directly punished 1~2 million. Direct responsibility for the accident and have the corresponding responsibility of lprovisions, on the job unit fined 300 yuan, the unit will charge a fine of 100 Yuan. 7.5.3 accident penalties (1) injuries fa th theible unit fined 200 Yuan, construction person in charge a fine of 50 Yuan. (8) no permit to work and the job in accordance wiies of team a fine of 50 Yuan. (7) at height and the opening and provisional protective measures have been taken, the responsibilitillegal carrying, using gas cylinders, each operator fined 20 Yuan. Gas bottle without the hot sun exposure measures, responstion engineering construction standard 7, HG ... Pressure gauges, using an installed spark arrestor for acetylene cylinders, 2000 construction installa11 m2- m 1、y=(m-2)x 是关于x的二次函数，则m=( ) A -1 B 2 C -1或2 D m不存在 22、下列函数关系中，可以看作二次函数y=ax+bx+c(a?0)模型的是( ) A 在一定距离内，汽车行驶的速度与行驶的时间的关系 B 我国人中自然增长率为1%，这样我国总人口数随年份变化的关系 C 矩形周长一定时，矩形面积和矩形边长之间的关系 D 圆的周长与半径之间的关系 。3、在Rt?ABC中,?C=90 ,AB=5,AC=3.则sinB的值是( ) 3434 A B C D 554324、将一抛物线向下向右各平移2个单位得到的抛物线是y=-x，则抛物线的解析式是( ) 22 A y=—( x-2)+2 B y=—( x+2)+2 22 C y=— ( x+2)+2 D y=—( x-2)—2 125、抛物线y= x-6x+24的顶点坐标是( ) 2 A (—6，—6) B (—6，6) C (6，6) D(6，—6) 26、已知函数y=ax+bx+c,图象如图所示，则下列结论中正确的有( )个 y ?abc〈, ?a，c〈b ? a+b+c 〉, ? ,c〈,b A , B , C , D , 2—1 、函数y=ax-bx+c(a?0)的图象过点(-1，0)，则 71 x 0 y bca = = 的值是( ) b，ca，ca，b 11A -1 B 1 C D - 22-1 0 x 28、已知一次函数y= ax+c与二次函数y=ax+bx+c(a?0)，它们在同一坐标系内的大致图象是图中的( ) y y y y x x x x A B C D 29、如图所示，二次函数y=x-4x+3的图象交x轴于A、B两点，交y轴于C点，则?ABC y 的面积为( ) C A 6 B 4 C 3 D1 A B 0 x 10、如图所示，在矩形ABCD中，DE?AC于E，设?ADE=α， 3且cosα= , AB=4,则AD的长为( ) C 5D 162016A 3 B C D 335E A B unit will charge a fine of 100 Yuan. 7.5.3 accident penalties (1) injuries fatalities directly punished 1~2 million. Direct r, the charge a fine of 50 Yuan. (8) no permit to work and the job in accordance with the provisions, on the job unit fined 300 yuanthe opening and provisional protective measures have been taken, the responsible unit fined 200 Yuan, construction person in t and tor fined 20 Yuan. Gas bottle without the hot sun exposure measures, responsibilities of team a fine of 50 Yuan. (7) at heighPressure gauges, using an installed spark arrestor for acetylene cylinders, illegal carrying, using gas cylinders, each opera2000 construction installation engineering construction standard 7, HG ... -98 compressor, fan and pump installation engineering construction and acceptance specification for lifting 6 HG20201-neering construction and acceptance specification for 5 GB502752009 mechanical equipment installation engi-1997 steel welded atmospheric pressure vessel 4 GB50231-T47352005 vertical cylindrical steel pressure vessel steel welded specification for construction and acceptance of oil tank 3 JB/ -98 2 GB50128-ring 1 GB1502000 steel pressure vessel products mechanical properties test of welded plate II, mechanical equipment installation enginee-welding procedures of steel pressure vessel NDT 9 JB/T4744administrative sanctions should be dealt with by the personnel Department of the company. (3) personal injury ing10,000 yuan, responsible for the direct responsibility for the accident and the responsibility of leadership, such as concern-.5, should be brought to the company or the relevant Department. (2) personal injury accident occurred, the direct punishment 0ctionsesponsibility for the accident and have the corresponding responsibility of leadership, such as concerning administrative san12 11 某学校的围墙上端由一段段相同的拱形栅栏组面，如图所示，其拱形图形为抛物线的一部分，栅栏的路径A B间，按相同的间距0.2米用5根立柱加固,拱高,,为,.6米,以,为原点, ,,所在的直线为y轴建立平面直角坐标系,根据以上的数据,则一段栅栏所需立 柱的总长度(精确到0.1米)为( )米 C A B A 1.5 B 1.9 C 2.3 D 2.5 o x 12、如图所示，已知?ABC中，BC,,，BC上的高h=4,,为,,上一点(,,?,,， 交,,与点,，交,,于点,(,,不过,、,)，设,到,,的距离为x，则?,E, 的面积y关于x的函数的图象大致为( ) A y y y y E F o 4 o o o x 4 4 x 2 2 2 x 4 x 2 B C D A B C D 二填空题: 213、无论m为任何实数，总在抛物线y=x，,mx，m上的点的坐标是 ———————————————。 114、函数y=中的自变量的取值范围是———————————————。 1,2,x 15、已知α为等边三角形的一个内角，则sinα等于———————————————。 2216、若抛物线y=ax+bx+c(a?0)的对称轴为直线x,,，最小值为,,，则关于方程ax+bx+c ,,,的根为 ———————————————。y 22 A117、抛物线y=(k+1)x+k-9开口向下，且经过原点，则k,————————— 18、如图，在直角坐标系中，将矩形,,,,沿,,对折，使点,落 B C 3在点,处，已知,,,，,,,,，则点,的坐标是,,——————— 解答题: 0 x 、A 319 计算:2cos60?+sin60?-3tan45? 20、 如图，河对岸有古塔,,，小敏在,处测得塔顶,的仰角α，向塔前进s米到达,点， A 在,处测得A的仰角为β，则塔高是多少米, C B D tion engineering construction standard 7, HG ... Pressure gauges, using an installed spark arrestor for acetylene cylinders, 2000 construction installa-98 compressor, fan and pump installation engineering construction and acceptance specification for lifting 6 HG20201-2009 mechanical equipment installation engineering construction and acceptance specification for 5 GB50275-502311997 steel welded atmospheric pressure vessel 4 GB-T47352005 vertical cylindrical steel pressure vessel steel welded specification for construction and acceptance of oil tank 3 JB/ -98 2 GB50128-ate II, mechanical equipment installation engineering 1 GB1502000 steel pressure vessel products mechanical properties test of welded pl-welding procedures of steel pressure vessel NDT 9 JB/T4744the company. (3) personal injury responsibility of leadership, such as concerning administrative sanctions should be dealt with by the personnel Department of 10,000 yuan, responsible for the direct responsibility for the accident and the-injury accident occurred, the direct punishment 0.5ship, such as concerning administrative sanctions, should be brought to the company or the relevant Department. (2) personal eadertalities directly punished 1~2 million. Direct responsibility for the accident and have the corresponding responsibility of lprovisions, on the job unit fined 300 yuan, the unit will charge a fine of 100 Yuan. 7.5.3 accident penalties (1) injuries fa th theible unit fined 200 Yuan, construction person in charge a fine of 50 Yuan. (8) no permit to work and the job in accordance wiies of team a fine of 50 Yuan. (7) at height and the opening and provisional protective measures have been taken, the responsibilitillegal carrying, using gas cylinders, each operator fined 20 Yuan. Gas bottle without the hot sun exposure measures, respons13 221 已知抛物线y=x+(n-3)x+n+1经过坐标原点O。 ? 求这条抛物线的顶点P的坐标 ?设这条抛物线与x轴的另外一个交点为A，求以直线PA为图象的一次函数解析式 22 已知:在?ABC中，BC=20，高AD=16，内接矩形EFGH的顶点E、F在BC上，G、H A 分别在AC、AB上，求内接矩形EFGH的最大面积。 H G B C E D F .5, should be brought to the company or the relevant Department. (2) personal injury accident occurred, the direct punishment 0ctionsesponsibility for the accident and have the corresponding responsibility of leadership, such as concerning administrative sanunit will charge a fine of 100 Yuan. 7.5.3 accident penalties (1) injuries fatalities directly punished 1~2 million. Direct r, the charge a fine of 50 Yuan. (8) no permit to work and the job in accordance with the provisions, on the job unit fined 300 yuanthe opening and provisional protective measures have been taken, the responsible unit fined 200 Yuan, construction person in t and tor fined 20 Yuan. Gas bottle without the hot sun exposure measures, responsibilities of team a fine of 50 Yuan. (7) at heighPressure gauges, using an installed spark arrestor for acetylene cylinders, illegal carrying, using gas cylinders, each opera2000 construction installation engineering construction standard 7, HG ... -98 compressor, fan and pump installation engineering construction and acceptance specification for lifting 6 HG20201-neering construction and acceptance specification for 5 GB502752009 mechanical equipment installation engi-1997 steel welded atmospheric pressure vessel 4 GB50231-T47352005 vertical cylindrical steel pressure vessel steel welded specification for construction and acceptance of oil tank 3 JB/ -98 2 GB50128-ring 1 GB1502000 steel pressure vessel products mechanical properties test of welded plate II, mechanical equipment installation enginee-welding procedures of steel pressure vessel NDT 9 JB/T4744administrative sanctions should be dealt with by the personnel Department of the company. (3) personal injury ing10,000 yuan, responsible for the direct responsibility for the accident and the responsibility of leadership, such as concern-14