1 |
4 |
bn | ||
1-
|
1 |
bn-1 |
bn | ||
1-
|
1-an |
(1-an)(1+an) |
1 |
1+an |
1 |
bn+1-1 |
1 |
bn-1 |
1 | ||
|
1 |
1-an-1 |
1 |
an |
1 |
an |
1 |
4 |
3 |
4 |
1 |
b1-1 |
1 |
bn-1 |
1 |
bn-1 |
1 |
n+3 |
n+2 |
n+3 |
n+2 |
n+3 |
1 |
n+3 |
1 |
4×5 |
1 |
5×6 |
1 |
(n+3)•(n+4) |
1 |
4 |
1 |
5 |
1 |
5 |
1 |
6 |
1 |
n+3 |
1 |
n+4 |
1 |
4 |
1 |
n+4 |
n |
4(n+4) |
an |
n+4 |
n+2 |
n+3 |
(a-1)n2+(3a-6)n-8 |
(n+3)(n+4) |
3a-6 |
2(a-1) |
3 |
2 |
1 |
a-1 |
15 |
4 |
A.公差为0的等差数列 | B.公比为1的等比数列 |
C.常数数列1,1,1 | D.以上都不对 |
A.100 | B.-12 | C.-60 | D.-66 |
A.12 | B.24 | C.36 | D.48 |
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