题目列表(包括答案和解析)
| x2-y2 |
| xy |
| x |
| x-y |
| x |
| y |
| 1-x |
| x-2 |
| 2 |
| 2-x |
| x2-4x |
| x2-8x+16 |
| 2m-n |
| n-m |
| m |
| m-n |
| n |
| n-m |
| 3 |
| x-1 |
| x+2 |
| x(x-1) |
| 1 |
| x+1 |
| 2 |
| x-1 |
| 4 |
| x2-1 |
| 5ab |
| 3c |
| 12c2 |
| 5ab2 |
| 4c |
| b |
| 4c |
| b |
| x2 |
| x-y |
| y2 |
| y-x |
| 4 |
| a-2 |
| x2+6x+9 |
| x2-9 |
| x-3 |
| x+2 |
| x+3 |
| x |
| a-b |
| a |
| 2ab-b2 |
| a |
| x-4 |
| x-3 |
| 1 |
| 3-x |
| 3y-1 |
| y |
| 2y |
| y-1 |
| 3 |
| 1 |
| 2 |
| 1 |
| 1-3x |
| 3 |
| 2 |
| 2 |
| 3x-1 |
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