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

ݷʱ : 2024/12/28 23:12:14һ µȫĶ

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1 B 2 C 3 B 4 B 5 C 6 C 7 B 8 A 9 D 10 D 11 C 12 A 100

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19.⣺1.

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ŷ 50 ϼ 60 10 20 30 50 30 80 110 ...

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Ͽ֪ͨ·ʱʱΪ㣮.................................................12

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

444

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

2ֱlIJ̣tΪCֱ귽̿ɵã3t28t

16=0 t1+t2=t1t2=

...............................7

|t1t2|===

+===1...............................10

23.⣺1ߺfx=|2x+1|+|2xa||2x+12xa|=|a+1|fxСֵΪ2|a+1|=2a=1 a=3...............................5 2fx|2x4|Ľ⼯xʱfx|2x4| |2x+1|+|2xa||2x4|2x1+|2xa|42x....................7

|2xa|55+a2x5+a

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