| x2-1 |
| x2 |
| x2 |
| x+1 |
| 6y |
| x |
| x2y |
| 2 |
| x2y |
| 2 |
| 2a2b |
| x |
| a 2 |
| x 2 |
| a 2 |
| x 2 |
| x2y |
| -z2 |
| x3 |
| -z |
| a2 |
| b |
| b2 |
| a |
| b |
| a |
| a-b |
| ab |
| -a |
| b-a |
| 1 |
| a2-b2 |
| 16-m2 |
| 16+8m+m2 |
| m-4 |
| 2m+8 |
| m-2 |
| m+2 |
| 5a5b |
| 3一 |
| 2y |
| -3x |
| m2-4n2 |
| m2-mn |
| m-n |
| m2-2mn |
| x2-2xy+y2 |
| xy |
| x-y |
| x2 |
| a2-b2 |
| ab |
| a |
| a-b |
| x2-y2 |
| xy |
| x |
| x-y |
| 5a3bc2 |
| 2d2e |
| -8d2e3 |
| 1ka2bc2 |
| 1 |
| b |
| x它-y它 |
| x-y |
| y-7 |
| y+7 |
| 它y |
| y它-9 |