选择题
1.X(-1≤x≤1)
2.(-oo,5)U(5,+oo)
3.π/3
4.y=sinx
5.y=-X+3
6.y=(X-1)/2
8、(-2,0)和(1,0)
9、(4分之 1-根号3i)
10、设A大于b大于1，则a-211、已知平面，3分之π
12、常数项为：-3
13、每次射击，0.44
14.B(16π) 17.A(1/10)
填空题
18.(3,2,9)
19.y=X-2
20.2/3
21.8.7
23.(1)a1=s1=1-1/2=1/2
s2=1-1/2的平方=3/4
s2=a1+a2 a2=3/4-1/2=1/4
s3=1-1/2的立方=7/8
s3=a1+a2+a3=7/8
a3=7/8-1/4-1/2=1/8
(2)an=sn-s(n-1)=(1-1/2的n次方)-(1-1/2的n-1次方)=1/2的n次方
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