题目内容
化简：(x+y)
+
=______．
| x2 |
| x2-y2 |
| y2 |
| y-x |
(x+y)
+
=（x+y）
+
=
-
=x+y．
故答案为x+y．
| x2 |
| x2-y2 |
| y2 |
| y-x |
=（x+y）
| x2 |
| (x+y)(x-y) |
| y2 |
| y-x |
=
| x2 |
| x-y |
| y2 |
| x-y |
=x+y．
故答案为x+y．
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