| x |
| 3y |
| y |
| 2x-5y |
| 6x-z5y |
| x |
| 4x2-5xy+6y2 |
| x2-2xy+3y2 |
| b2+c2-a2 |
| 2bc |
| c2+a2-b2 |
| 2ca |
| a2+b2-c2 |
| 2ab |
| 9 |
| 3+a2 |
| xy |
| x+y |
| 1 |
| 3 |
| yz |
| y+z |
| 1 |
| 5 |
| zx |
| z+x |
| 1 |
| 6 |
| xyz |
| xy+yz+zx |
| |x-2| |
| x-2 |
| |x-1| |
| x-1 |
| |x| |
| x |
| 1 |
| a |
| 1 |
| b |
| 3 |
| a |
| b(a-b) |
| b |
| a(a-b) |
| |x-1| |
| 1-x |
| |x-2| |
| x-2 |
| x+3y-z |
| 2x-y+z |
| 1 |
| 2 |
| 1 |
| x-1 |
| 1 |
| x |
| 6 |
| x |
| 6 |
| y |
| 3x+5xy-3y |
| x-xy-y |