| 1 |
| 2 |
| 2-x |
| x-3 |
| 2 |
| 3-x |
| x-1 |
| x-4 |
| 3 |
| x-4 |
| 3 |
| 2x-2 |
| 1 |
| 1-x |
| 1 |
| 3-x |
| 2-x |
| x-3 |
| x2-3x |
| x2-1 |
| 2x-1 |
| x-1 |
| x |
| x-2 |
| 4 |
| x-2 |
| x |
| x-2 |
| 2 |
| x2-4 |
| 2-x |
| x-3 |
| 2 |
| 3-x |
| 2 |
| x+1 |
| x |
| x2-1 |
| x |
| x-2 |
| 2 |
| x2-4 |
| x |
| x-4 |
| 4 |
| 4-x |
| 3 |
| x-1 |
| x+6 |
| x(x-1) |
| 1 |
| y-2 |
| 1-y |
| 2-y |
| 5 |
| 3 |
| x |
| x-1 |
| 3 |
| 1-x |
| 二 |
| x-二 |
| 2x |
| x+二 |
| 二 |
| 2 |
| 7 |
| x+2 |
| x2-2x |
| 二 |
| x-2 |
| 2 |
| x2-4 |
|
| 4 |
| x2-2x |
| 1 |
| x |
| 2 |
| x-2 |
| a2-5a+2 |
| a+2 |
| a2-4 |
| a2+4a+4 |
| 3 |