题目列表(包括答案和解析)
| 1 |
| 1×2 |
| 1 |
| 1 |
| 1 |
| 2 |
| 1 |
| 2×3 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 3×4 |
| 1 |
| 3 |
| 1 |
| 4 |
| 2 |
| 1×2 |
| 2 |
| 2×3 |
| 2 |
| 3×4 |
| 2 |
| n×(n+1) |
| 2 |
| 2-4 |
| 6 |
| 6-4 |
| 5 |
| 5-4 |
| 3 |
| 3-4 |
| 7 |
| 7-4 |
| 1 |
| 1-4 |
| 10 |
| 10-4 |
| -2 |
| -2-4 |
| 20 |
| 20-4 |
| () |
| ()-4 |
| 1 |
| 2×3 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 3×5 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 5 |
| 1 |
| 1×4 |
| 1 |
| 4×7 |
| 1 |
| 7×10 |
| 1 |
| (3n-2)(3n+1) |
| 3 |
| 2 |
| 3 |
| 2 |
| 4 |
| 3 |
| 4 |
| 3 |
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