江西省九江一中2011届高三高考适应性考试
适应性(一)考试文科数学参考答案:
1~10 BBDCA BCCBB
11、(是错题,不用!)y 3x 1 ;12、-3 ;13、15、①②③ 三、解答题:
16 解;(1)an=2n+1
(2) bn
1
;14、V (S1 S2 S3 S4) R;
34
1111
) =(
anan 122n 12n 3
∴Tn=
1111( )< 232n 36
11
c b sinAcosC sinC sinB. 2分 22
17.解:2、解答:(Ⅰ)由acosC
1
sinAcosC sinC sin(A C) sinAcosC cosAsinC.
2
1
sinC cosAsinC. 4分 2
1
∵C (0, )∴sinC 0, cosA . A . 6分
23
(Ⅱ)由正弦定理得:b
asinB22 sinB,c sinC. 8分
sinA323
[sinB sin(A B)]
l a b c 1
2(sinB sinC) 1
1 2(
∵A
31
sinB cosB) 1 2sin(B ). 10分 226,∴B (0,
2 5
), B (,). ∴l的范围是:(2,3] 3666
3
18.解: 17.解:(1)各组的频率分别是:0.1,0.2,0.3,0.2,0.1,0.1,
所以图中各组的纵坐标分别是:0.01,0.02,0.03,0.02,0.01,0.01,