题目内容
计算：
÷(x-y)•
．
| x2+xy |
| x2-xy |
| x2-xy |
| xy |
原式=
•
•
=
•
•
=
．
| x(x+y) |
| x(x-y) |
| 1 |
| x-y |
| x(x-y) |
| xy |
=
| x+y |
| x-y |
| 1 |
| x-y |
| x-y |
| y |
=
| x+y |
| xy-y2 |
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题目内容
| x2+xy |
| x2-xy |
| x2-xy |
| xy |
| x(x+y) |
| x(x-y) |
| 1 |
| x-y |
| x(x-y) |
| xy |
| x+y |
| x-y |
| 1 |
| x-y |
| x-y |
| y |
| x+y |
| xy-y2 |
=－1；