题目列表(包括答案和解析)
| x2+x |
| x |
| x2-x-2 |
| x-2 |
| 1 |
| x+1 |
| 2 |
| x-1 |
| 4 |
| x2-1 |
| x+1 |
| 2 |
| 2-3x |
| 3 |
| x-1 |
| 2 |
| 2 |
| 3 |
| x+2 |
| 3 |
| 3-x |
| 2x-4 |
| 5 |
| x-2 |
| x |
| x-y |
| y2 |
| x+y |
| x4y |
| x4-y4 |
| x2 |
| x2+y2 |
| 5 |
| 2x+3 |
| 3 |
| x-1 |
| x |
| x+2 |
| x+2 |
| x-2 |
| 8 |
| x2-4 |
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