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