1 |
2-an |
1 |
an-1 |
9 |
10 |
3 |
5 |
1 |
an+1-1 |
1 | ||
|
2-an |
an-1 |
1 |
an-1 |
1 |
an+1-1 |
1 |
an-1 |
1 |
an-1 |
1 |
an-1 |
1 |
a1-1 |
1 |
n |
1 |
x+1 |
1 |
n |
1 |
n |
1 |
n |
1 |
n |
1 |
n |
n-1 |
n |
9 |
10 |
bn |
bn+1 |
n-1 |
n |
n+1 |
n |
10 |
9 |
n2-1 |
n2 |
10 |
9 |
bn |
bn+1 |
n2-1 |
n2 |
10 |
9 |
10 |
bn |
bn+1 |
n2-1 |
n2 |
10 |
9 |
10 |
3 |
4 |
9 |
10 |
19683 |
40000 |
24000 |
40000 |
3 |
5 |
3 |
5 |
A.9 | B.9或10 | C.10 | D.10或11 |
A.38 | B.111 | C.11 | D.都不对 |
A.公差为零的等差数列 | B.公比为1的等比数列 |
C.常数列 | D.这样的数列不存在 |
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