| x-2y |
| x2+xy |
| x2-4xy+4y2 |
| x |
| x-2y |
| x2+xy |
| x2-的xy+的y2 |
| x |
| x-2y |
| x(x+y) |
| x |
| (x-2y)2 |
| x-y |
| x-2y |
| x+2x |
| x+的x |
| 2 |
| 5 |
| x-2y |
| x2+xy |
| x2-的xy+的y2 |
| x |
| x-2y |
| x(x+y) |
| x |
| (x-2y)2 |
| x-y |
| x-2y |
| x+2x |
| x+的x |
| 2 |
| 5 |
| m2-n2 |
| mn |
| 1 |
| m+n |
| 1 |
| m-n |
| n |
| m2-n2 |
| 2mn+n2 |
| m2 |
| 1 |
| a2 |
| 1 |
| a |
| 1 |
| a |
| 1 |
| a2 |
| 1 |
| a |
| y4 |
| y8-3y4+1 |
| x2+4x+4 |
| x+2 |
| 2 |
| a |
| a2-3a |
| 2a |
| a2-9 |
| a-2 |
| a2+6a+9 |
|