人教版初二下册数学期末试卷及答案

人教版初二 下册 数学七年级下册拔高题下载二年级下册除法运算下载七年级下册数学试卷免费下载二年级下册语文生字表部编三年级下册语文教材分析 数学期末试卷及答案 附中2010-2011学年度下期期末考试 初二数学试题 (总分:150分 考试时间:120分钟) 一、选择题(每小题4分，共40分) 221( 在这六个实数中，无理数的个数是( ) ,，，，，，,9233.1407 A(4个 B(3个 C(2个 D(1个 2( 下列计算正确的是( ) A( B( 532,,824，, C(2733, D( (12)(12)1，,, 4，,:C903( 已知Rt?ABC中，，BC = 8，，则AC = ( ) sinA,5 3210 D( A(6 B(8 C(3 4( 如图，小正方形的边长均为1，则下列图中三角形(阴影部分)与?ABC相似的是( ) D B C (第4题图) A 5( 如图，设M、N分别为直角梯形ABCD两腰AD、CB的中点，D C DE?AB于点E，将?ADE沿DE翻折，M与N恰好重合，则M N AE?BE等于( ) E B A A(2?1 B(1?2 (第5题图) C(3?2 D(2?3 226( 关于x的方程kxkx，,，,(21)10有实数根，则下列结论正确的是( ) 11A(当时方程两根互为相反数 B(当时方程有实数根 k,k,24 k,,1C(当时方程两根互为倒数 D(当k = 0时方程的根是x = – 1 222222()(1)2xyxyxy，，，,，，则7( 已知实数x、y满足的值为( ) A(1 B(2 C(– 2或1 D(2或 – 1 2yx,28( 已知的图象是抛物线，若抛物线不动，将x轴、y轴分别向上、向右平移2个单位，在新坐标advantages, facing the Yangtze River Delta, Pearl River Delta, Shandong peninsula, Beijing-Tianjin-Tangshan area, targeted investment promotion several times. Industry-led unit and various town streets are developing detailed promotion plans, the basis of what is specific to each industry, has formed a kind of scale, need to bring in the kind of projects each town street has the kind of resources, what location, focus on the development of the kind of industries. Four stroke technology and science. Determinants of technology is the County's economic development through scientific and technological innovation, improve product value-added and improve economic competitiveness, is the inevitable way to achieve leapfrog development. Talent is the city center city's first resource, is the primary industry development, and revitalization of the social protection. So, in terms of skills: to catch ... Competitive. Encouraging enterprises to actively undertake science and technology projects, strengthening research cooperation, using advanced technology to increase the added value of their products to ensure that introduction of transforming scientific and technological achievements during the year ... ... New research enterprises ... ... Home, creating innovative platforms ... ... Generic classifier. In: first, we must strengthen the cultivation of talent, efforts to increase vocational education and training and meet the basic demand of enterprise development. Then introduced a number of the county needed scarce education, health professionals, meet social development needs to invest more in machinery, pharmaceutical manufacturing research and development in higher education, such as the introduction of talent to meet the need. Third, we must rely on ... ... Post-doctoral workstation, ... ... Food research station platform, to the XX University to find experts 系下，所得抛物线解析式为( ) 22A( B( yx,,，2(2)2yx,，,2(2)2 22C( D( yx,,,2(2)2yx,，，2(2)2 49( 如图，?OAP、?ABQ均是等腰直角三角形，点P、Q在函数的图象上，直角顶点A、Byx,,(0)x均在x轴上，则点B的坐标为( ) A((，0) B((，0) 21，51, C((3，0) D((，0) 51， A 墙 y E P 2 m Q 1 m 2 m 9.6 m B C D O A B x (第14题图) (第10题图) (第9题图) 410( 如图，已知AD为等腰三角形ABC底边上的高，且，AC上有一点E，满足AE?EC = 2?tan，,B3 tan，ADE3，那么的值是( ) 3211A( B( C( D( 3253 二、填空题(每小题3分，共30分) 2xx，,2011( 方程的解为_________________( 112( 已知为锐角，若_________________( ,,,,,，则sincos3 221mm，,13( 已知是反比例函数，则m = _________________( ymmx,，(2) 22abab,,,(2)50x，,,14( 在实数范围内定义一种运算“*”，其规则为，根据这个规则，方程的解为 _________________( ,,,40x15( 如图是一个二次函数当的图象，则此时函数y的取值范围是_________________( 16( 小亮同学想利用影长测量学校旗杆的高度，如图，他在某一时刻立1m长的标杆测得其影长为2 m， 同时旗杆的投影一部分在地面上，另一部分在某建筑物的墙上，分别测得其长度为9.6 m和2 m，则 学校旗杆的高度为_________________m( y 墙 4 2 m 1 m advantages, facing the Yangtze River Delta, Pearl River Delta, Shandong peninsula, Beijing-Tianjin-Tangshan area, targeted inveO x stment promotion several times. Industry-led unit and various town streets are developing detailed promotion plans, the basis of what is specific to each industry, has formed a kind of scale, need to bring in the kind of projects each town street has the kind of resources, what location, focus on the development of the kind of industries. Four stroke technology and science. Determinants of technology is the County's economic development through scientific and technological innovation, improve product value-added and improve economic competitiveness, is the inevitable way to achieve leapfrog development. Talent is the city center city's first resource, is the primary industry development, and revitalization of the social protection. So, in terms of skills: to catch ... Competitive. Encouraging enterprises to actively undertake science and technology projects, strengthening research cooperation, using advanced technology to increase the added value of their products to ensure that introduction of transforming scientific and technological achievements during the year ... ... New research enterprises ... ... Home, creating innovative platforms ... ... Generic classifier. In: first, we must strengthen the cultivation of talent, efforts to increase vocational education and training and meet the basic demand of enterprise development. Then introduced a number of the county needed scarce education, health professionals, meet social development needs to invest more in machinery, pharmaceutical manufacturing research and development in higher education, such as the introduction of talent to meet the need. Third, we must rely on ... ... Post-doctoral workstation, ... ... Food research station platform, to the XX University to find experts – 4 2 m 9.6 m – 2 (第16题图) (第15题图) 更多免费试卷下载绿色圃中 小学 小学生如何制作手抄报课件柳垭小学关于三违自查自纠报告小学英语获奖优质说课课件小学足球课教案全集小学语文新课程标准测试题 教育网www.lspjy.com 分站www.fydaxue.com 217( 一个三角形两边长为3和4，若第三边长是方程的一个根，则这个三角形的形状为xx,，,8150 _________________( 18( 已知开口向下的抛物线过A(– 1，0)，B(3，0)两点，与y轴交于C，且，则这条抛物线BC,32 的解析式为_________________( 19( 如图，?ABCD中，E为CD上一点，DE?CE = 2?3，连结AE、BE、BD，且AE、BD交于点F，则 S?S?S= _________________( ???DEFEBFABF 220( 如图，二次函数的图象经过点(– 1，2)和(1，0)，且与y轴交于负半轴，给出以下yaxbxc,，， 四个结论:? abc < 0;? 2a + b > 0;? a + c = 1;? a > 1(其中正确结论的序号是 _________________( y E D C F x O B A (第20题图) (第19题图) advantages, facing the Yangtze River Delta, Pearl River Delta, Shandong peninsula, Beijing-Tianjin-Tangshan area, targeted inve更多免费试卷下载绿色圃中小学教育网www.lspjy.com stment promotion several times. Industry-led unit and various town streets are developing detailed promotion plans, the basis o分站www.fydaxue.com f what is specific to each industry, has formed a kind of scale, need to bring in the kind of projects each town street has the kind of resources, what location, focus on the development of the kind of industries. Four stroke technology and science. Determinants of technology is the County's economic development through scientific and technological innovation, improve product value-added and improve economic competitiveness, is the inevitable way to achieve leapfrog development. Talent is the city center city's first resource, is the primary industry development, and revitalization of the social protection. So, in terms of skills: to catch ... Competitive. Encouraging enterprises to actively undertake science and technology projects, strengthening research cooperation, using advanced technology to increase the added value of their products to ensure that introduction of transforming scientific and technological achievements during the year ... ... New research enterprises ... ... Home, creating innovative platforms ... ... Generic classifier. In: first, we must strengthen the cultivation of talent, efforts to increase vocational education and training and meet the basic demand of enterprise development. Then introduced a number of the county needed scarce education, health professionals, meet social development needs to invest more in machinery, pharmaceutical manufacturing research and development in higher education, such as the introduction of talent to meet the need. Third, we must rely on ... ... Post-doctoral workstation, ... ... Food research station platform, to the XX University to find experts 三、解答题(共80分) 11201,,，，,:,()()|tan303|21( (6分) (1) 计算: 233 12(6分) (2) 解方程: xx，，,302 222( (10分) 已知抛物线的图象如图所示( yaxbxc,，， y (1) 抛物线的解析式为____________________( 2 (2) 抛物线的顶点坐标为______________，且y有最________ (填“大”或“小”)值( – 1 O 4 x (3) 当x _____________时，y随x的增大而减小( (第22题图) 2axbxc，，,0(4) 根据图象可知，使不等式成立的x的取值 范围是______________________( 423( (8分) 如图，在?ABC中，，求AB的长( ，,:,,BCAC30sin10，，5A C B (第23题图) advantages, facing the Yangtze River Delta, Pearl River Delta, Shandong peninsula, Beijing-Tianjin-Tangshan area, targeted investment promotion several times. Industry-led unit and various town streets are developing detailed promotion plans, the basis of what is specific to each industry, has formed a kind of scale, need to bring in the kind of projects each town street has the kind of resources, what location, focus on the development of the kind of industries. Four stroke technology and science. Determinants of technology is the County's economic development through scientific and technological innovation, improve product value-added and improve economic competitiveness, is the inevitable way to achieve leapfrog development. Talent is the city center city's first resource, is the primary industry development, and revitalization of the social protection. So, in terms of skills: to catch ... Competitive. Encouraging enterprises to actively undertake science and technology projects, strengthening research cooperation, using advanced technology to increase the added value of their products to ensure that introduction of transforming scientific and technological achievements during the year ... ... New research enterprises ... ... Home, creating innovative platforms ... ... Generic classifier. In: first, we must strengthen the cultivation of talent, efforts to increase vocational education and training and meet the basic demand of enterprise development. Then introduced a number of the county needed scarce education, health professionals, meet social development needs to invest more in machinery, pharmaceutical manufacturing research and development in higher education, such as the introduction of talent to meet the need. Third, we must rely on ... ... Post-doctoral workstation, ... ... Food research station platform, to the XX University to find experts 更多免费试卷下载绿色圃中小学教育网www.lspjy.com 分站www.fydaxue.com k24( (10分) 如图，反比例函数的图象与一次函数的图象交于A(1，3)，B(n，– 1)ymxb,，y,x 两点( (1) 求反比例函数与一次函数的解析式; (2) 根据图象，直接写出使反比例函数的值大于一次函数的值的x的取值范围( y A x O B (第24题图) advantages, facing the Yangtze River Delta, Pearl River Delta, Shandong peninsula, Beijing-Tianjin-Tangshan area, targeted inve更多免费试卷下载绿色圃中小学教育网www.lspjy.com stment promotion several times. Industry-led unit and various town streets are developing detailed promotion plans, the basis o分站www.fydaxue.com f what is specific to each industry, has formed a kind of scale, need to bring in the kind of projects each town street has the kind of resources, what location, focus on the development of the kind of industries. Four stroke technology and science. Determinants of technology is the County's economic development through scientific and technological innovation, improve product value-added and improve economic competitiveness, is the inevitable way to achieve leapfrog development. Talent is the city center city's first resource, is the primary industry development, and revitalization of the social protection. So, in terms of skills: to catch ... Competitive. Encouraging enterprises to actively undertake science and technology projects, strengthening research cooperation, using advanced technology to increase the added value of their products to ensure that introduction of transforming scientific and technological achievements during the year ... ... New research enterprises ... ... Home, creating innovative platforms ... ... Generic classifier. In: first, we must strengthen the cultivation of talent, efforts to increase vocational education and training and meet the basic demand of enterprise development. Then introduced a number of the county needed scarce education, health professionals, meet social development needs to invest more in machinery, pharmaceutical manufacturing research and development in higher education, such as the introduction of talent to meet the need. Third, we must rely on ... ... Post-doctoral workstation, ... ... Food research station platform, to the XX University to find experts 25( (10分) 西瓜经营户以2元/千克的价格购进一批小型西瓜，以3元/千克的价格出售，每天可售出200 千克(为了促销，该经营户决定降价销售，经调查发现，这种小型西瓜每降价0.1元/千克，每天可多 售出40千克，另外，每天的房租等固定成本共24元，该经营户要想每天盈利200元，应将每千克小 型西瓜的售价降低多少元, ，,:,,BACABAC904，26( (10分) 如图，在等腰直角三角形ABC中，，点D在线段BC上运动(不 ，,:ADE45与B、C重合)，过D作，交AC于E( (1) 求证:?ABD??DCE; (2) 设BD = x，AE = y，求y与x之间的函数关系式，并写出自变量的取值范围( A E D B C (第26题图) advantages, facing the Yangtze River Delta, Pearl River Delta, Shandong peninsula, Beijing-Tianjin-Tangshan area, targeted investment promotion several times. Industry-led unit and various town streets are developing detailed promotion plans, the basis of what is specific to each industry, has formed a kind of scale, need to bring in the kind of projects each town street has the kind of resources, what location, focus on the development of the kind of industries. Four stroke technology and science. Determinants of technology is the County's economic development through scientific and technological innovation, improve product value-added and improve economic competitiveness, is the inevitable way to achieve leapfrog development. Talent is the city center city's first resource, is the primary industry development, and revitalization of the social protection. So, in terms of skills: to catch ... Competitive. Encouraging enterprises to actively undertake science and technology projects, strengthening research cooperation, using advanced technology to increase the added value of their products to ensure that introduction of transforming scientific and technological achievements during the year ... ... New research enterprises ... ... Home, creating innovative platforms ... ... Generic classifier. In: first, we must strengthen the cultivation of talent, efforts to increase vocational education and training and meet the basic demand of enterprise development. Then introduced a number of the county needed scarce education, health professionals, meet social development needs to invest more in machinery, pharmaceutical manufacturing research and development in higher education, such as the introduction of talent to meet the need. Third, we must rely on ... ... Post-doctoral workstation, ... ... Food research station platform, to the XX University to find experts 更多免费试卷下载绿色圃中小学教育网www.lspjy.com 分站www.fydaxue.com (10分) 如图，甲、乙两辆大型货车同时从A地出发驶往P市(甲车沿一条公路向北偏东53方向行: 驶，直达P市，其速度为30千米/小时(乙车先沿一条公路向正东方向行驶1小时到达B地，卸下部 分货物(卸货的时间不计)，再沿一条北偏东37方向的公路驶往P市，其速度始终为35千米/小时( : (3) 求AP间的距离( (4) 已知在P市新建的移动通信接收发射塔，其信号覆盖面积只可达P市周围方圆50千米的区域(包 括边缘地带)，除此以外，该地区无其他发射塔，问甲、乙两司机至少经过多少小时可以互相正 常通话, 3434() sin37cos53cos37sin53tan37tan53:,:,:,:,:,:,，，，5543 37 :53 : (第27题图) advantages, facing the Yangtze River Delta, Pearl River Delta, Shandong peninsula, Beijing-Tianjin-Tangshan area, targeted inve更多免费试卷下载绿色圃中小学教育网www.lspjy.com stment promotion several times. Industry-led unit and various town streets are developing detailed promotion plans, the basis o分站www.fydaxue.com f what is specific to each industry, has formed a kind of scale, need to bring in the kind of projects each town street has the kind of resources, what location, focus on the development of the kind of industries. Four stroke technology and science. Determinants of technology is the County's economic development through scientific and technological innovation, improve product value-added and improve economic competitiveness, is the inevitable way to achieve leapfrog development. Talent is the city center city's first resource, is the primary industry development, and revitalization of the social protection. So, in terms of skills: to catch ... Competitive. Encouraging enterprises to actively undertake science and technology projects, strengthening research cooperation, using advanced technology to increase the added value of their products to ensure that introduction of transforming scientific and technological achievements during the year ... ... New research enterprises ... ... Home, creating innovative platforms ... ... Generic classifier. In: first, we must strengthen the cultivation of talent, efforts to increase vocational education and training and meet the basic demand of enterprise development. Then introduced a number of the county needed scarce education, health professionals, meet social development needs to invest more in machinery, pharmaceutical manufacturing research and development in higher education, such as the introduction of talent to meet the need. Third, we must rely on ... ... Post-doctoral workstation, ... ... Food research station platform, to the XX University to find experts 227( (10分) 如图，抛物线与x轴交于A、B两点(点A在点B的左侧)，与y轴交于点C，yaxbxc,，， 这条抛物线的顶点是M(1，– 4)，且过点(4，5)( (1) 求这条抛物线的解析式; (2) P为线段BM上的一点，过点P向x轴引垂线，垂足为Q，若点P在线段BM上运动(点P不与 点B、M重合)，四边形PQAC的面积能否等于7,如果能，求出点P的坐标;如果不能，请说 明理由( (3) 设直线m是抛物线的对称轴，是否存在直线m上的点N，使以N、B、C为顶点的三角形是直角 三角形,若存在，请求出点N的坐标;若不存在，请说明理由( y Q x O A B P C M (第28题图) advantages, facing the Yangtze River Delta, Pearl River Delta, Shandong peninsula, Beijing-Tianjin-Tangshan area, targeted investment promotion several times. Industry-led unit and various town streets are developing detailed promotion plans, the basis of what is specific to each industry, has formed a kind of scale, need to bring in the kind of projects each town street has the kind of resources, what location, focus on the development of the kind of industries. Four stroke technology and science. Determinants of technology is the County's economic development through scientific and technological innovation, improve product value-added and improve economic competitiveness, is the inevitable way to achieve leapfrog development. Talent is the city center city's first resource, is the primary industry development, and revitalization of the social protection. So, in terms of skills: to catch ... Competitive. Encouraging enterprises to actively undertake science and technology projects, strengthening research cooperation, using advanced technology to increase the added value of their products to ensure that introduction of transforming scientific and technological achievements during the year ... ... New research enterprises ... ... Home, creating innovative platforms ... ... Generic classifier. In: first, we must strengthen the cultivation of talent, efforts to increase vocational education and training and meet the basic demand of enterprise development. Then introduced a number of the county needed scarce education, health professionals, meet social development needs to invest more in machinery, pharmaceutical manufacturing research and development in higher education, such as the introduction of talent to meet the need. Third, we must rely on ... ... Post-doctoral workstation, ... ... Food research station platform, to the XX University to find experts 更多免费试卷下载绿色圃中小学教育网www.lspjy.com 分站www.fydaxue.com 附中2010—2011学年度下期期末考试 初二数学试题参考答案 一、选择题(每小题4分，共40分) 题号 1 2 3 4 5 6 7 8 9 10 选项 C C A B A B A B D C 二、填空题(每小题3分，共30分) 2211(x = 0，x = – 2 12( 13(– 1 123 14(x = 3，x = – 7 15( 16(6.8 ,,,24y12 217(等腰或直角三角形 18( yxx,,，，23 19(4?10?25 20(??? 三、解答题(共80分) 233,，，,,13|3|21((1) 解:原式 ????????????????????????????????????????????????????????????????????????? 3分 33 23,，,123 ?????????????????????????????????????????????????????????????????????????????????????? 5分 3 43,，1 ??????????????????????????????????????????????????????????????????????????????????????????????? 6分 3 1(2) 解:a = 1，b = 3，c = 2 12? bac,,,，，,494172 ,,37x,? ???????????????????????????????????????????????????????????????????????????????????????????? 5分 2 ,，,,3737xx,,，? ????????????????????????????????????????????????????????????????????? 6分 1222 13222((1) yxx,,，，222 325(2) () 大 ，28 3(3) ,2 advantages, facing the Yangtze River Delta, Pearl River Delta, Shandong peninsula, Beijing-Tianjin-Tangshan area, targeted inve更多免费试卷下载绿色圃中小学教育网www.lspjy.com stment promotion several times. Industry-led unit and various town streets are developing detailed promotion plans, the basis o分站www.fydaxue.com f what is specific to each industry, has formed a kind of scale, need to bring in the kind of projects each town street has the kind of resources, what location, focus on the development of the kind of industries. Four stroke technology and science. Determinants of technology is the County's economic development through scientific and technological innovation, improve product value-added and improve economic competitiveness, is the inevitable way to achieve leapfrog development. Talent is the city center city's first resource, is the primary industry development, and revitalization of the social protection. So, in terms of skills: to catch ... Competitive. Encouraging enterprises to actively undertake science and technology projects, strengthening research cooperation, using advanced technology to increase the added value of their products to ensure that introduction of transforming scientific and technological achievements during the year ... ... New research enterprises ... ... Home, creating innovative platforms ... ... Generic classifier. In: first, we must strengthen the cultivation of talent, efforts to increase vocational education and training and meet the basic demand of enterprise development. Then introduced a number of the county needed scarce education, health professionals, meet social development needs to invest more in machinery, pharmaceutical manufacturing research and development in higher education, such as the introduction of talent to meet the need. Third, we must rely on ... ... Post-doctoral workstation, ... ... Food research station platform, to the XX University to find experts (4) (每空2分) xx,,,14或 23(解:过A作AD?BC于D ?????????????????????????????????????????????????????????????????????????????????????????? 1分 4A ? AD?BC，，AC = 10 sinC,5 ? ?????????????????????????????????????5分 ADACC,, sin8 ，,:B30? C B D (第23题图) ? AB = 2AD = 16?????????????????????????????????????????????8分 k24(解:(1) ? A(1，3)，B(n，– 1)在反比例函数的图象上 y,x 3,k,,? ???????????????????????????????????????????????????????????????????????????????????????????????? 2分 ,k,,1,n, kn,,,33，? ?????????????????????????????????????????????????????????????????????????????????????????? 3分 ? A(1，3)，B(n，– 1)在一次函数的图象上 ymxb,， 3,，mb,,????????????????????????????????????????????????????????????????????????????????????????? 4分 ?,,,,，13mb,, m,1,, ???????????????????????????????????????????????????????????????????????????????????????????????? 5分 解得,b,2,, 3? 反比例函数与一次函数的解析式分别为 ?????????????????????????? 6分 yyx,,，，2x (2) ?????????????????????????????????????????????????????????????????????????????????????????10分 xx,,,,301或 25(解:设每千克小型西瓜的售价降低x元，由题意 ???????????????????????????????????????????????????????? 1分 x ????????????????????????????????????????????????????????????????????? 5分 (32)(20040)24200,,，，,,x0.12502530xx,，, (51)(103)0xx,,, ? x = 0.2，x = 0.3?????????????????????????????????????????????????????????????????????????????????????????? 9分 12 答:应将每千克小型西瓜的售价降低0.2元或0.3元( ??????????????????????????????????????????????10分 ，,:BAC9026((1) 证明:? ，AB = AC ，,，,:BC45? ???????????????????????????????????????????????????????????????????????????????????? 1分 ，，，，，,:C23180? A ，，，,:23135? ??????????????????????2分 ，，，，，,:，,:1218045ADEADE，? E ，，，,:12135? ??????????????????????3分 3 ，,，13? ????????????????????????????????4分 1 2 D C B ? ?ABD??DCE ????????????????????5分 (第26题图) (2) 解:? AB = AC = 4 BC,42? ???????????????????????????????????????????????????????????????????????????????????????????????? 6分 advantages, facing the Yangtze River Delta, Pearl River Delta, Shandong peninsula, Beijing-Tianjin-Tangshan area, targeted investment promotion several times. Industry-led unit and various town streets are developing detailed promotion plans, the basis of what is specific to each industry, has formed a kind of scale, need to bring in the kind of projects each town street has the kind of resources, what location, focus on the development of the kind of industries. Four stroke technology and science. Determinants of technology is the County's economic development through scientific and technological innovation, improve product value-added and improve economic competitiveness, is the inevitable way to achieve leapfrog development. Talent is the city center city's first resource, is the primary industry development, and revitalization of the social protection. So, in terms of skills: to catch ... Competitive. Encouraging enterprises to actively undertake science and technology projects, strengthening research cooperation, using advanced technology to increase the added value of their products to ensure that introduction of transforming scientific and technological achievements during the year ... ... New research enterprises ... ... Home, creating innovative platforms ... ... Generic classifier. In: first, we must strengthen the cultivation of talent, efforts to increase vocational education and training and meet the basic demand of enterprise development. Then introduced a number of the county needed scarce education, health professionals, meet social development needs to invest more in machinery, pharmaceutical manufacturing research and development in higher education, such as the introduction of talent to meet the need. Third, we must rely on ... ... Post-doctoral workstation, ... ... Food research station platform, to the XX University to find experts 更多免费试卷下载绿色圃中小学教育网www.lspjy.com 分站www.fydaxue.com ? BD = x，AE = y ? ????????????????????????????????????????????????????????????????????????? 7分 CDxCEy,,,,424， ? ?ABD??DCE， ABBDx4,,即? ?????????????????????????????????????????????????????????????????? 9分 DCCEy4,42,x 12? ???????????????????????????????????????????????????????????????10分 yxxx,,，,,24(042)4 27(解:(1) 过P作PD?AB延长线于D ?????????????????????????????????????????????????????????????????????????? 1分 由题意知:AB = 35千米 ，,:，,:PADPBD3753， 设PD = x千米 PD? 在Rt?PAD中， tan37:,AD37 53 :: x4D ? ????????????????????????? 2分 ADx,,tan373:(第27题图) PD?在Rt?PBD中， tan53:,BD PD3 ???????????????????????????????????????????????????????????????????????????????????? 3分 ?BDx,,tan534: 43? AD – BD = AB即 xx,,3534 ? x = 60，即 AD = 60千米 ??????????????????????????????????????????????????????????????????????????? 4分 PD?在Rt?PAD中， sin37:,AP PD60? 千米 ????????????????????????????????????????????????????????????????????? 5分 AP,,,100sin370.6: PD(2) ?在Rt?PBD中， sin53:,BD PD60PB,,,75? 千米?????????????????????????????????????????????????????????????????????? 6分 4sin53: 3 设甲、乙两司机分别出发t、t小时后手机有信号 12 PA,,50100505? 小时???????????????????????????????????????????????????????????????? 7分 t,,,130303 PBAB，,，,503575506012 小时 ????????????????????????????????????????? 8分 t,,,,23535357 5351236? ????????????????????????????????????????????????????????????????????????? 9分 tt,,,,,12321721 12? 甲、乙两司机至少经过小时可以正常通话( ??????????????????????????????????????10分 7 22yax,,,(1)4yxx,,,2328(解:(1) 设代入(4，5)得a = 1，? ?????????????????????????? 2分 advantages, facing the Yangtze River Delta, Pearl River Delta, Shandong peninsula, Beijing-Tianjin-Tangshan area, targeted inve更多免费试卷下载绿色圃中小学教育网www.lspjy.com stment promotion several times. Industry-led unit and various town streets are developing detailed promotion plans, the basis o分站www.fydaxue.com f what is specific to each industry, has formed a kind of scale, need to bring in the kind of projects each town street has the kind of resources, what location, focus on the development of the kind of industries. Four stroke technology and science. Determinants of technology is the County's economic development through scientific and technological innovation, improve product value-added and improve economic competitiveness, is the inevitable way to achieve leapfrog development. Talent is the city center city's first resource, is the primary industry development, and revitalization of the social protection. So, in terms of skills: to catch ... Competitive. Encouraging enterprises to actively undertake science and technology projects, strengthening research cooperation, using advanced technology to increase the added value of their products to ensure that introduction of transforming scientific and technological achievements during the year ... ... New research enterprises ... ... Home, creating innovative platforms ... ... Generic classifier. In: first, we must strengthen the cultivation of talent, efforts to increase vocational education and training and meet the basic demand of enterprise development. Then introduced a number of the county needed scarce education, health professionals, meet social development needs to invest more in machinery, pharmaceutical manufacturing research and development in higher education, such as the introduction of talent to meet the need. Third, we must rely on ... ... Post-doctoral workstation, ... ... Food research station platform, to the XX University to find experts ?????????????????????????????????????????????????????????????????????????????????????????????????????????????????? 8分 22222n,,4?若?C = Rt?，则，? ? NBBCNC,，nn，,，，，418(3)1 ?????????????????????????????????????????????????????????????????????????????????????????????????????????????????? 9分 ,，317,,317(1)，(1)，综上，存在这样的点N，其坐标为或或(12)，或(1，) ,422 ????????????????????????????????????????????????????????????????????????????????????????????????????????????????????10分 advantages, facing the Yangtze River Delta, Pearl River Delta, Shandong peninsula, Beijing-Tianjin-Tangshan area, targeted investment promotion several times. Industry-led unit and various town streets are developing detailed promotion plans, the basis of what is specific to each industry, has formed a kind of scale, need to bring in the kind of projects each town street has the kind of resources, what location, focus on the development of the kind of industries. Four stroke technology and science. Determinants of technology is the County's economic development through scientific and technological innovation, improve product value-added and improve economic competitiveness, is the inevitable way to achieve leapfrog development. Talent is the city center city's first resource, is the primary industry development, and revitalization of the social protection. So, in terms of skills: to catch ... Competitive. Encouraging enterprises to actively undertake science and technology projects, strengthening research cooperation, using advanced technology to increase the added value of their products to ensure that introduction of transforming scientific and technological achievements during the year ... ... New research enterprises ... ... Home, creating innovative platforms ... ... Generic classifier. In: first, we must strengthen the cultivation of talent, efforts to increase vocational education and training and meet the basic demand of enterprise development. Then introduced a number of the county needed scarce education, health professionals, meet social development needs to invest more in machinery, pharmaceutical manufacturing research and development in higher education, such as the introduction of talent to meet the need. Third, we must rely on ... ... Post-doctoral workstation, ... ... Food research station platform, to the XX University to find experts