| 2b |
| a2-b2 |
| 1 |
| a+b |
|
| 4ab-4b2 |
| a |
| 4 |
| a |
| 3 |
| x+1 |
| 1 |
| x |
| 2x2-x |
| x2+2x+1 |
| x+2 |
| x2-2x |
| x-1 |
| x2-4x+4 |
| x-4 |
| x |
| x |
| 2 |
| y |
| 3 |
| z |
| 它 |
| 2x+y-z |
| 3x-2y+z |
| x2-2xy+y2 |
| xy |
| x2-y2 |
| x2 |
| b |
| a-b |
| a |
| a-b |
| 2 |
| m2-4 |
| 1 |
| 2m-4 |
| x3-x2 |
| x2-x |
| 1-x |
| x+1 |
| 3 |
| x多-多x+1 |
| x多-1 |
| x-3 |
| x+1 |
| 12 |
| m2-9 |
| 2 |
| 3-m |
| 3x |
| x-1 |
| 2x |
| x+1 |
| x |
| x2-1 |
| 1 |
| a-1 |
| a2-4a+4 |
| a2-a |