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一項是符合題目要求的.12345678DCBDACBC項符合題目要求.全部選對的得5分,部分選對但不全的得2分,有錯選的得0分.9ABDABD三、填空題:本題共4小題,每小題5分645451a+b四、解答題:本題共6小題,共70分.解答應(yīng)寫出文字說明 ·································································· ·································································· ··············································2 ··············································解得ab<9 1故12absinC<································································································································3nnann,ann(2)設(shè)bn=n+3nan=n+36n?4n3n,T+4n3n,3T2+4n3n+1·······················Snnn (2)設(shè)M(xM,yM),因為點M是AB的中點,C1M⊥AB, yMyMyMyMxxyMyMM2012分)故x+y=0.019··············解得x=0.004,y=0.015·········(2)①學(xué)院畢業(yè)生年薪在[30,80)區(qū)間的人數(shù)比例為:(3) 3 223=0.0081·····································ξ的分布列為:ξ01234r2112分)ex2ex(a)a若a=4,函數(shù)單調(diào)遞減,無極大值··極大值f(2)=>0············································································12分x2422x24(1)橢圓E:,F2即m2+n2=3···············································又m22(2)(2)設(shè)P點坐標為(p,0),則可得Q2?2p,22 2(2)(2)

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