| 2x |
| x-1 |
| x |
| x+1 |
| x |
| x2-1 |
| 口-2 |
| 口2-1 |
| 2口+2 |
| 口2+2口+1 |
| 1 |
| 口-1 |
| 1 |
| x+2 |
| 2 |
| x-2 |
| 3x+2 |
| x2+2x |
| 3 |
| x2-2x+1 |
| x2-1 |
| x-1 |
| x2+x |
| x下-1 |
| x-1 |
| 下x |
| x3+下x下+x |
| a |
| a2-3a |
| 2a |
| a2-9 |
| a-2 |
| a2+6a+9 |
|
| 1 |
| x-2 |
| x2-2x+1 |
| x2-4 |
| 1 |
| x-2 |
| x2-1 |
| 2x-4 |
| 1 |
| a-b |
| 1 |
| a+b |
| b |
| a2-2ab+b2 |
| 2 |
| 2 |
| 2x |
| x-1 |
| x2-2x |
| x-2 |
| a-你 |
| a你+你a |
| a-如 |
| a你+手a+手 |
| a-手 |
| a+你 |