最新湖北省黄冈?018-2019学年高二下学期期末考试文科数学试题word版有答案 - 百度文库 ر

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ŷ 50 ϼ 60 10 20 30 50 30 80 110 ...

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21.⣺I֪úg(x)ĶΪ(0,1)?(1,??),...........................1

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lnx?x?g?(x)?1x?lnx?1,...........................2 (lnx)2(lnx)2x?eʱ,g?(x)?0 Ժg(x)(e,??);...........................4 0?x?ex?1ʱ,g?(x)?0Ժg(x)ĵ(0,1),(1,e), .....6 IIf(x)(1,??)Ϊf(x)?x?ax. lnx1?a?0(1,??)Ϻ Եx?(1,??)ʱf?(x)?0.....8 f?(x)?lnx?2max(lnx)1?a??1f?(x)?lnx?2lnx(lnx)??2?1?a??1?1lnxlnx2??a ??142...

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ʵ1?1x?e2ʱf?(x)max?1?a ...............................8

lnx241?a?0,a1aСֵΪ1...............................12

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22.⣺1Cļ귽Ϊsin2=4cosȣ2sin2=4cosȣɵֱ귽̣y2=4x...............................5

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|t1t2|===

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|2xa|55+a2x5+a

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