题目内容
化简:
-
.
| x2 |
| y-x |
| y2 |
| y-x |
原式=
-
=
=
=-x-y.
| x2 |
| y-x |
| y2 |
| y-x |
=
| x2-y2 |
| y-x |
=
| (x+y)(x-y) |
| y-x |
=-x-y.
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题目内容
| x2 |
| y-x |
| y2 |
| y-x |
| x2 |
| y-x |
| y2 |
| y-x |
| x2-y2 |
| y-x |
| (x+y)(x-y) |
| y-x |