題目列表(包括答案和解析)
| 2x |
| x+2 |
| 3 |
| x-2 |
| 3 |
| x |
| 6 |
| x-1 |
| 7 |
| x2-x |
| x+1 |
| x |
| 5x |
| x+1 |
| x-2 |
| x+2 |
| 16 |
| x2-4 |
| x+2 |
| x-2 |
| 1 |
| x+3 |
| 2 |
| 3-x |
| 12 |
| x2-9 |
| 1 |
| x-2 |
| 2x |
| 2-x |
| 1 |
| x-2 |
| x-1 |
| 2-x |
| 1 |
| x2+3x |
| 2 |
| x2-9 |
| 1 |
| x2-3x |
| 2 |
| x+1 |
| x |
| x2-1 |
| 1-x |
| 2-x |
| 1 |
| x-2 |
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