| x |
| x-y |
| 2y |
| x-y |
| x-2y |
| xy |
| 1 |
| x |
| 1 |
| y |
| x-2y |
| x-y |
| xy |
| x-2y |
| x+y |
| xy |
| x+y |
| x-y |
| x+y |
| x-y |
| 1 |
| x |
| 1 |
| y |
| 5x+xy-5y |
| x-xy-y |
A．
| B．-
| C．-3 | D．3 |
| 12xy |
| 5a |
| 1 |
| x |
| 1 |
| y |
| y-x |
| 3x2 |
| a2 |
| a-b |
| b2 |
| b-a |
| a+b |
| a-b |
| a2-b2 |
| a2-ab |
| 2ab+b2 |
| a |
| 3 |
| x-1 |
| 1 |
| x+1 |
| x |
| x2-1 |
| 1 |
| 2 |
| a2 |
| a+1 |
| 1 |
| a+1 |
| a-1 |
| a2-4a+4 |
| a2-4 |
| 2a-2 |
| 4 |
| 2-m |
| x |
| x+y |
| 2y |
| x+y |
| xy |
| x+2y |
| 1 |
| x |
| 1 |
| y |
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