1 |
anan+1 |
A.
| B.
| C.
| D.
|
|
1 |
anan+1 |
1 |
n(n+1) |
1 |
n |
1 |
n+1 |
1 |
2 |
1 |
2 |
1 |
3 |
1 |
100 |
1 |
101 |
1 |
101 |
100 |
101 |
An |
Bn |
7n+45 |
n+3 |
an |
bn |
A.2 | B.3 | C.4 | D.5 |
S3-S2 |
S5-S3 |
A.2 | B.3 | C.
| D.不存在 |
A.S7 | B.S7或S8 | C.S14 | D.S8 |
A.260 | B.168 | C.156 | D.130 |
1 |
anan+1 |
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