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一、选择题(本大题共10小题,每小题5分,满分50分.在每小题给出的四个选项中,只有一项是符合题目要求的)
题号
1
2
3
4
5
6
7
8
9
10
答案
D
C
B
B
C
A
D
B
A
C
二、填空题(每小题4分,共28分)
11.1+2i 12.5 13. 14. 13
15. 2或 16. 17.9
三、解答题:本大题共5小题,满分72分.解答须写出文字说明、证明过程和演算步骤.
18.(本题满分14分)
解:(1)f(x)= T=4
(2) (3)两边平方得
,而 ∴
19.(本小题满分14分)
(1)证明:∵A/O⊥面CEFB
∴EF⊥A/O,又EF⊥EC
A/O∩EC=0
∴EF⊥面A/EC
而A/C面A/EC
∴EF⊥A/C
(2)
20.(本题满分14分)
解:(1)an+1=2Sn+1,an=2Sn-1+1两式相减得an+1=3an(a≥2),又a2=2S1+1=
∴ {an}是以a1=1为首项,3为公比的等比数列,an=3n-1
(2)Tn=5n2+20n
21.(本小题满分15分)
解:(1)W:x2=6y
(2)设AC:
设A(x1,y1),C(x2,y2) |AC|=6(k2+1)
同理|BD|=6
SABCD=
当k=±1时取等号
22.(本小题满分15分)
解:(1)f(x)=ax34ax2+4ax
f/(x)=3ax28ax+
∵f(x)有极大值32,而f(2)=0 ∴f()=32=7,a=27
(2)f/(x)=a(3x2)(x2)
当a>0时,f(x)=[ 2,]上递增在[]上递减,
∴0<a<
当a<0时,f(x)在[2,]上递减,在[]上递增
f(2)=
综上
组别 | (10,20] | (20,30] | (30,40] | (40,50] | (50,60] | (60,70] |
频数 | 2 | 3 | 4 | 5 | 6 | 7 |
组别 | (10,20] | (20,30] | (30,40] | (40,50] | (50,60] | (60,70] |
频数 | 2 | 3 | 4 | 5 | 6 | 7 |
组别 | (10,20] | (20,30] | (30,40] | (40,50] | (50,60] | (60,70] |
频数 | 2 | 3 | 4 | 5 | 6 | 7 |
组别 | (10,20] | (20,30] | (30,40] | (40,50] | (50,60] | (60,70] |
频数 | 2 | 3 | 4 | 5 | 6 | 7 |
组别 | (10,20] | (20,30] | (30,40] | (40,50] | (50,60] | (60,70] |
频数 | 2 | 3 | 4 | 5 | 6 | 7 |