1 |
2 |
n+1 |
n |
Sn |
n3+3n2 |
5 |
12 |
n+1 |
n |
n |
n-1 |
1+1 |
1 |
n+1 |
n |
n+1 |
n |
n2 |
n+1 |
Sn |
n3+3n |
1 |
(n+1)(n+3) |
1 |
2 |
1 |
n+1 |
1 |
n+3 |
1 |
2 |
1 |
2 |
1 |
4 |
1 |
3 |
1 |
5 |
1 |
n |
1 |
n+2 |
1 |
n+1 |
1 |
n+3 |
1 |
2 |
5 |
6 |
1 |
n+2 |
1 |
n+3 |
5 |
12 |
S(m+1)n |
Smn |
A.25 | B.50 | C.100 | D.不存在 |
. |
| . |
. |
| . |
3 |
2 |
21 |
16 |
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