1 |
n(n+2) |
1 |
120 |
A.9项 | B.10项 | C.11项 | D.12项 |
1 |
n(n+2) |
1 |
120 |
1 |
n(n+2) |
1 |
120 |
n |
n+2 |
A.an>an+1 | B.an<an+1 | C.an=an+1 | D.不能确定 |
A.
| B.
| C.
| D.
|
3 |
5 |
7 |
2n-1 |
5 |
A.第22项 | B.第23项 | C.第24项 | D.第28项 |
na |
nb+c |
A.an>an+1 | B.an<an+1 | C.an=an+1 | D.不能确定 |
2an |
2+an |
1 |
2 |
A.0 | B.1 | C.-1 | D.2 |
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