| 1 |
| a-1 |
| a |
| 2a-2 |
| 1 |
| a-1 |
| a |
| 2a-2 |
| a-1+1 |
| a-1 |
| 2(a-1) |
| a |
| x+2 |
| x2-6x+9 |
| 1 |
| 3-x |
| x-3 |
| x+2 |
| x2-1 |
| x2-2x+1 |
| x |
| x-1 |
| x+y |
| x-y |
| 4xy |
| y2-x2 |
| x2+2xy-3y2 |
| x2-9y2 |
| 1 |
| x2-x |
| x-2 |
| x2-2x+1 |
| x-2 |
| x-1 |
| 1+x |
| x2+x-2 |
| x2-1 |
| x+2 |
| 1 |
| 2 |
| y3-y |
| (xy+1)2-(x+y)2 |
| (x+y)y |
| x+1 |
| 1 |
| 12 |
| 1 |
| n |
| m2-2mn+n2 |
| mn |
| mn-m2 |
| m2 |
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