| -a |
| b |
| 2a2 |
| 5b |
| a |
| 5b |
| x+2 |
| x2-2x |
| x-1 |
| x2-4x+4 |
| x-4 |
| x |
| y2 |
| 6x |
| 1 |
| 手x2 |
| a2-如 |
| 8a2她 |
| 12a她 |
| 手a-6 |
| 1 |
| a-1 |
| a2 |
| 1-a2 |
| 2 |
| x2-如 |
| 1 |
| 2x-如 |
| a2-25 |
| a2+10a+25 |
| a2-1 |
| a+5 |
| a2+a |
| a-5 |
| x2 |
| y-x |
| y2 |
| y-x |
| a-b |
| a |
| 2ab-b2 |
| a |
| 12xy |
| 5a |
| a2-1 |
| a2+4a+4 |
| a+1 |
| a+2 |
| 12 |
| m2-9 |
| 2 |
| m-3 |
| x+2 |
| x2-2x |
| x-1 |
| x2-4x+4 |
| x-4 |
| x |
| 5x |
| x-手 |
| x |
| x+手 |
| 2x |
| x2-手 |
| 2a |
| a2-4 |
| 二 |
| 2-a |
| a2-4b2 |
| 4ab2 |
| ab |
| a+2b |
| x2-2x |
| x+1 |
| 1 |
| x |
| x-1 |
| x |
| 1 |
| x |
| 1 |
| x-1 |
| x |
| x2-1 |