1 |
2 |
1 |
3 |
1 |
n2 |
A.1项 | B.k项 | C.2k项 | D.2k+1项 |
1 |
2 |
1 |
3 |
1 |
k2 |
1 |
2 |
1 |
3 |
1 |
k2 |
1 |
k2+1 |
1 |
(k+1)2 |
1 |
k2+1 |
1 |
(k+1)2 |
1 |
k2+1 |
1 |
k2+2 |
1 |
k2+2k+1 |
| ||
3 |
| ||
8 |
| ||
a+b |
| ||
24 |
A.(21,-5) | B.(-21,5) | C.(-
| D.(
|
3+n2 |
4 |
A.第3项 | B.第4项 | C.第5项 | D.第6项 |
A.
| B.
| C.
| D.
|
1 |
(n+1)2 |
A.第5项 | B.第6项 | C.第7项 | D.第8项 |
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