3an |
2an+1 |
3 |
5 |
3 |
5 |
1 |
an |
3 |
5 |
3an |
2an+1 |
3a1 |
2a1+1 |
9 |
11 |
3a2 |
2a2+1 |
27 |
29 |
1 |
an+1 |
2an+1 |
3an |
1 |
an+1 |
1 |
3 |
1 |
an |
1 |
a1 |
2 |
3 |
1 |
an |
2 |
3 |
1 |
3 |
1 |
an |
2 |
3 |
1 |
3 |
2 |
3n |
3n |
3n+2 |
1 |
an |
1 |
a1 |
1 |
3 |
1 |
an |
1 |
a1 |
1 |
3 |
3an |
2an+1 |
1 |
an+1 |
1 |
an |
1 |
a1 |
1 |
3 |
1 |
a1 |
1 |
3 |
1 |
a1 |
1 |
1×2 |
1 |
2×3 |
1 |
3×4 |
A.
| B.
| C.
| D.以上都不对 |
|
|
3 |
5 |
n! |
10n |
A.递增数列 | B.递减数列 |
C.从某项后为递减 | D.从某项后为递增 |
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