| x+2 |
| x2-6x+9 |
| 1 |
| 3-x |
| x-3 |
| x+2 |
| x2-1 |
| x2-2x+1 |
| x |
| x-1 |
| x2-2x+1 |
| x2-1 |
| x-1 |
| x2+x |
| a2 |
| a2+2a |
| a2-4 |
| a-2 |
| x2+y2 |
| x-y |
| 2xy |
| x-y |
| 1 |
| x |
| 1 |
| y |
| 2x-6 |
| 4-4x+x2 |
| x-2 |
| 3-x |
| 1 |
| 2x |
| 1 |
| x+y |
| x+y |
| 2x |
| x2-2xy+y2 |
| xy |
| x-y |
| x2 |
| x-2 |
| x2-1 |
| 2x+2 |
| x2+2x+1 |
| 1 |
| x-1 |
| x+3 |
| x-3 |
| x-3 |
| x+3 |
| 12x |
| x2-6x+9 |
| a-1 |
| a2-4a+4 |
| a2-1 |
| a2-4 |
| 2a |
| a2-4 |
| 1 |
| 2-a |
| a图-1 |
| a图+6a+9 |
| a图-9 |
| a-1 |
| x图+1 |
| x图-1 |
| x-图 |
| x-1 |
| x-图 |
| x |
| 2a |
| a2-1 |
| 1 |
| a-1 |
| 2-x |
| x-1 |
| 3 |
| x-1 |
| w |
| a |
| w |
| b |
| a-b |
| ab |
| x-2 |
| x+2 |
| 4x |
| x2-4 |
| w |
| x2-4 |