| 3 |
| 4-x |
| x-1 |
| x-4 |
| 2x-5 |
| x-2 |
| 3x-3 |
| x-2 |
| x+2 |
| x2-2x |
| x-1 |
| x2-4x+4 |
| x-4 |
| x |
| x+1 |
| x-1 |
| 4 |
| x2-1 |
| 3 |
| 2 |
| 1 |
| 3x-1 |
| 5 |
| 6x-2 |
| a |
| a-1 |
| a2-a |
| a2-1 |
| 1 |
| a-1 |
| 1 |
| x+3 |
| 2 |
| 3-x |
| 12 |
| x2-9 |
| 2a+6 |
| a2-4a+4 |
| a-2 |
| a2+3a |
| 1 |
| a-2 |
| 1 |
| 3 |
| x+1 |
| x |
| x+2 |
| x-1 |
| rx2+2x |
| x2-2x+1 |
| x |
| x-1 |
| 2 |
| x |
| x-1 |
| x+1 |
| 4 |
| 1-x2 |
| x+2 |
| x-1 |
| 1 |
| 2x |
| 2 |
| x+3 |
| x |
| x-2 |
| 1 |
| x2-4 |
| x |
| x+2 |
| x+2 |
| x-2 |
| 8 |
| x2-4 |
| 3 |
| 2x-2 |
| 1 |
| 1-x |
| 2x |
| x+2 |
| 3 |
| x-2 |
| 3 |
| x |
| 6 |
| x-五 |
| x+u |
| x(x-五) |
| u |
| x-h |
| hx-u |
| x-h |