| x |
| x2-1 |
| x-1 |
| x |
| 1 |
| x-2 |
| x2-2x+1 |
| x2-4 |
| x2+y2+z2 |
| 2x2+y2-z2 |
| 3 |
| x |
| 2 |
| y |
| 2x-3y-xy |
| 7xy+9y-6x |
| 1 |
| 2a |
| 1 |
| a-b |
| a-b |
| 2a |
| 2 |
| 2 |
| a |
| bc |
| b |
| ca |
| c |
| ab |
| 1 |
| a |
| 1 |
| b |
| 1 |
| c |
| 4ab |
| a-b |
| 4ab |
| a+b |
| 3 |
| 2 |
| 1 |
| 2 |
| 9 |
| ah+a |
| 9 |
| ah+ha+9 |
|a-
| ||||
| a+9 |
| 1 |
| ab |
| 1 |
| (a+1)(b+1) |
| 1 |
| (a+2)(b+2) |
| 1 |
| (a+2004)(b+2004) |
| 二 |
| 1+二+二b |
| b |
| 1+b+bc |
| c |
| 1+c+c二 |
| a-2 |
| a2+2a |
| a-1 |
| a2+4a+4 |
| a-4 |
| a+2 |
| a2 |
| 2a2+bc |
| b2 |
| 2b2+ac |
| c2 |
| 2c2+ab |