| 2 |
| a2+b2-c2 |
| 2 |
| b2+c2-a2 |
| 2 |
| c2+a2-b2 |
| 1 |
| 1+a4 |
| 1 |
| 1+b4 |
| 1 |
| 1+c4 |
| 1 |
| 1+x4 |
| 1 |
| 1+y4 |
| 1 |
| 1+z4 |
| 1 |
| x |
| x2-6x+9 |
| x-3 |
| x+3 |
| x2+6x+9 |
| (x-2)3-(x-1)2+1 |
| x2-4x+4 |
| 2x |
| 2x2-4x |
| x2+y2+z2 |
| 2x2+y2-z2 |
| 3 |
| x |
| 2 |
| y |
| 2x-3y-xy |
| 7xy+9y-6x |
| x2-2x+1 |
| x2-1 |
| x-1 |
| x2+x |
| 1 |
| x |
| 1 |
| y |
| 2x-3xy+2y |
| x+2xy+y |
| 4ab |
| a-b |
| 4ab |
| a+b |
| 3 |
| 2 |
| 1 |
| 2 |
| 二 |
| 1+二+二b |
| b |
| 1+b+bc |
| c |
| 1+c+c二 |