ݷʱ : 2024/12/28 23:12:14һ µȫĶ
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2019괺߶ĩѧο𰸣Ŀƣ
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6t8ʱy>08 t 8 ʱ y ֵ ymax 18.75. .........................................................5 159 ڵ9t10ʱyt 84 t 10 ʱ ymax 16. .........................................................8 ۵10t12ʱy3(t11)218 t 11 ʱ ymax 18. .........................................................11 Ͽ֪ͨ·ʱʱΪ㣮.................................................12 21.⣺I֪úg(x)ĶΪ(0,1)?(1,??),...........................1 8 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... ... ʵ1?1x?e2ʱf?(x)max?1?a ...............................8 lnx241?a?0,a1aСֵΪ1...............................12 444 ѡ 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 ... ੁ7a1..10