| 3 |
| a-2 |
| a+1 |
| a2-4 |
| 1 |
| b |
| a-b |
| a+b |
| ab+bb |
| ab-bb |
| a+b |
| ab |
| abb+abb |
| ab+bb |
| a-b |
| a+b |
| 2(a-b) |
| a+b |
| a+b |
| 3(a-b) |
| m2 |
| m-2 |
| 4 |
| 2-m |
| x-3 |
| 2x-4 |
| 5 |
| x-2 |
| x+2 |
| x2-2x |
| x-1 |
| x2-4x+4 |
| x-4 |
| x |
| 3 |
| 3x |
| x-1 |
| x |
| x+1 |
| x |
| x2-1 |
| a2-b2 |
| ab |
| x |
| x-1 |
| x+3 |
| x2-1 |
| x2+2x+1 |
| x+3 |
| 3a2-ab |
| 9a2-6ab+b2 |
| 1 |
| 2 |
| x-2 |
| x+2 |
| x+2 |
| x-2 |
| 1 |
| y-x |
| 1 |
| 2y-2x |
| x-y |
| x+2y |
| x2-y2 |
| x2+4xy+4y2 |
| a+2 |
| a2-2a |
| a-1 |
| a2-4a+4 |
| 4-a |
| a2-2a |
| 2a+b |
| a+b |
| 4a2+4ab+b2 |
| a2-b2 |
| 1 |
| 2 |
| 2xy |
| x2-y2 |
| x2+y2 |
| x2-y2 |
| x-3 |
| x-2 |
| 5 |
| x-2 |
| x |
| 2 |
| y |
| 3 |
| z |
| 4 |
| 2x+y-z |
| 3x-2y+z |
| 3 |
| 4 |
| 3 |
| 4 |
| 3x2-12 |
| x2+4x+4 |
| a |
| x+2 |
| b |
| x-2 |
| 4x |
| x2-4 |
| 2 |
| x+3 |
| 2 |
| 3-x |
| 2x+18 |
| x2-9 |