題目列表(包括答案和解析)
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 2 |
| (1+2)×2 |
| 2 |
| (1+3)×3 |
| 2 |
| (1+4)×4 |
| 2 |
| (1+4)×4 |
| 2 |
| (1+9)×9 |
| 2 |
| (1+9)×9 |
| 2 |
| (1+n-1)(n-1) |
| 2 |
| (1+n)×n |
| 2 |
| (1+n-1)(n-1) |
| 2 |
| (1+n)×n |
| 2 |
| (1+2)×2 |
| 2 |
| (1+3)×3 |
| 2 |
| (1+4)×4 |
| 2 |
| (1+4)×4 |
| 2 |
| n(n-1) |
| 2 |
| n(n+1) |
| 2 |
| n(n-1) |
| 2 |
| n(n+1) |
| 2 |
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