| 2n2 |
| 3m |
| x2-2x+1 |
| x2-1 |
| x-1 |
| x2+x |
| 2m-6 |
| 4-4m+m2 |
| m2+6m+9 |
| 3-m |
| xy |
| x-y |
| x2-8x+16 |
| 4-x2 |
| 16-x2 |
| 4+4x+x2 |
| b2c |
| 3a |
| 9a2 |
| 2bc2 |
| a-b |
| 2a+2b |
| a2+b2 |
| a2-b2 |
| m2-1 |
| m2+4m+4 |
| m2+2m |
| m-1 |
| a2-b2 |
| ab |
| 1ux0 |
| ab |
| 口-2 |
| 口2-2口+1 |
| 口2-0 |
| 口2-1 |
| b |
| a |
| b |
| a2-a |
| 1 |
| a |
| 1 |
| b |
| 1 |
| x+2 |
| x+2 |
| x+1 |
| x+2 |
| x+1 |
| 2 |
| 3 |
| 2 |
| 3 |
| 6a |
| 8y |
| 2y2 |
| 3a2 |
| y |
| 2a |
| y |
| 2a |
| x+1 |
| y |
| x2-1 |
| y2 |
| y |
| x-1 |
| y |
| x-1 |
| x2 |
| y |
| y2 |
| x |
| y |
| x |