| 1 |
| a-x |
| 5 |
| ay-xy |
| A．（a-x）（ay-xy） | B．a（a-x） | C．y（a-x） | D．a-x |
| 5 |
| ay-xy |
| 5 |
| y(a-x) |
| 1 |
| a-x |
| 5 |
| ay-xy |
| 2y |
| x-y |
| 1 |
| x+y |
| x+2y |
| x2-y2 |
| 3 |
| 4xy |
| 2 |
| 3x2(x-y) |
| 1 |
| 2x-2y |
| b |
| 3a2c2 |
| c |
| -2ab |
| a |
| 5cb3 |
| 5 |
| 6x2y |
| 3 |
| 4xyz |
| A．12xyz | B．12x2yz | C．24xyz | D．24x2yz |
| x |
| x2-2x+1 |
| y |
| x2-1 |
| z |
| x2+2x+1 |
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