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一、选择题(每题5分,共60分)1.在△ABC中,SKIPIF1<0°,C=60°,c=1,则最短边的边长是( )A.SKIPIF1<0B.SKIPIF1<0C.SKIPIF1<0D.SKIPIF1<02.不等式SKIPIF1<0的解集是()A.(一∞,-2)U(7,+∞)B.(-2,7)C.[-2,,7] D.[-7,2]3.在各项均为正数的等比数列SKIPIF1<0中,SKIPIF1<0则SKIPIF1<0()A.4B.6C.8 D.SKIPIF1<04.设x、y满足SKIPIF1<0则SKIPIF1<0()A.有最小值2,最大值3B.有最小值2,无最大值C.有最大值3,无最大值D.既无最小值,也无最大值5.两座灯塔A和B与海洋观察站C的距离都等于akm,灯塔A在观察站C的北偏东20°,灯塔B在观察站C的南偏东40°,则灯塔A与灯塔B的距离为( )A.akmB.SKIPIF1<0kmC.2akmD.SKIPIF1<0km6.设{an}(n∈N*)是等差数列,Sn是其前n项的和,且S5<S6,S6=S7>S8,则下列结论错误的是( )A.d<0B.a7=0C.S9>S5D.S6与S7均为Sn的最大值7.已知等差数列{an}的前n项和为Sn,a5=5,S5=15,则数列SKIPIF1<0的前100项和为( )(A)SKIPIF1<0(B)(C)SKIPIF1<0(D)8.已知SKIPIF1<0为正实数,则下列不等式不一定成立的是( )A.SKIPIF1<0B.SKIPIF1<0C.SKIPIF1<0D.SKIPIF1<09.已知等比数列SKIPIF1<0中,SKIPIF1<0,数列SKIPIF1<0满足SKIPIF1<0。若SKIPIF1<0,则数列SKIPIF1<0前SKIPIF1<0项之和SKIPIF1<0的最大值是( )A.128B.130C.132D.13410.如果实数SKIPIF1<0满足SKIPIF1<0,目标函数SKIPIF1<0的最大值为12,最小值为3,那么实数SKIPIF1<0的值为( )A.2B.-2C.SKIPIF1<0D.不存在 11.已知SKIPIF1<0,当SKIPIF1<0时,SKIPIF1<0恒为正值,则SKIPIF1<0的取值范围是( )A.SKIPIF1<0B.SKIPIF1<0C.SKIPIF1<0D.SKIPIF1<012.若SKIPIF1<0,则函数SKIPIF1<0的最小值为( )A.SKIPIF1<0B.0C.2D.4二、填空题(每题4分,共16分)13.设点SKIPIF1<0在函数SKIPIF1<0的图象上运动,则SKIPIF1<0的最小值为。14.对于△ABC,有如下命题:①若SKIPIF1<0,则△ABC为等腰三角形;②若SKIPIF1<0,则△ABC为直角三角形;③若SKIPIF1<0,则△ABC为钝角三角形。其中正确命题的序号是。(把你认为所有正确的都填上)15.若不等式SKIPIF1<0的解集为SKIPIF1<0,则实数SKIPIF1<0__________.16.数列SKIPIF1<0满足SKIPIF1<0表示SKIPIF1<0前n项之积,则SKIPIF1<0=。二、填空题13.14.15.16.三、解答题(17-21每题12分,22题14分)17.在△ABC中,SKIPIF1<0分别是角A、B、C的对边,SKIPIF1<0,SKIPIF1<0。(1)求△ABC的面积;(2)若SKIPIF1<0,求角C。18.已知△ABC中,内角A、B、C对的边分别为SKIPIF1<0,A=2B,SKIPIF1<0。(1)求SKIPIF1<0的值。(2)若角A的平分线AD的长为2,求SKIPIF1<0的值。19.(1)求函数SKIPIF1<0的最小值。(2)已知SKIPIF1<0且SKIPIF1<0,求SKIPIF1<0的最大值及相应的SKIPIF1<0值。20.已知数列SKIPIF1<0的前SKIPIF1<0项和为SKIPIF1<0,且SKIPIF1<0,数列SKIPIF1<0是等差数列,且SKIPIF1<0(Ⅰ)求数列SKIPIF1<0和SKIPIF1<0的通项公式;(Ⅱ)设SKIPIF1<0,求数列SKIPIF1<0的前SKIPIF1<0项和SKIPIF1<0。21.数列SKIPIF1<0中,SKIPIF1<0且满足SKIPIF1<0。(1)求数列SKIPIF1<0的通项公式。(2)设SKIPIF1<0,求SKIPIF1<0(3)设SKIPIF1<0,是否存在最大的整数SKIPIF1<0,使得对任意SKIPIF1<0,均有SKIPIF1<0成立?若存在,求出SKIPIF1<0的值;若不存在,请说明理由。22.在等差数列SKIPIF1<0中,SKIPIF1<0.(Ⅰ)求数列SKIPIF1<0的通项公式;(Ⅱ)对任意SKIPIF1<0,将数列SKIPIF1<0中落入区间SKIPIF1<0内的项的个数记为SKIPIF1<0,求数列SKIPIF1<0的前SKIPIF1<0项和SKIPIF1<0.