| 4xy2 |
| 6x2y |
| 2y |
| 3x |
| 2y |
| 3x |
| a+b |
| a2-b2 |
| 1 |
| a-b |
| 1 |
| a-b |
| 5ab |
| 20a2b |
| 1 |
| 4a |
| 1 |
| 4a |
| x2-9 |
| x2-6x+9 |
| x+3 |
| x-3 |
| x+3 |
| x-3 |
| m-n |
| mn-mn |
| 1 |
| ( ) |
| 3a |
| 5xy |
| ( ) |
| 10axy |
| a+4 |
| a2-16 |
| 1 |
| ( ) |
| x2-1 |
| (x+1)2 |
| ( ) |
| x+1 |
| 4x |
| x2+xy |
| 4 |
| (&n7sp;) |
| 9mn2 |
| 36n3 |
| m |
| ( ) |
| x2+2xy+y2 |
| x2-y2 |
| x+y |
| ( ) |
| x2y+xy2 |
| xy3-x3y |
| 1 |
| y-x |
| 1 |
| y-x |
| x2-3x+2 |
| x2-4 |
| 12x2yz3 |
| -18x3yz2 |
| 2z |
| 3x |
| 2z |
| 3x |
| x2-4 |
| xy+2y |
| x-2 |
| y |
| x-2 |
| y |