题目内容
计算:(
+
)/
=______.
| 1 |
| x-y |
| 1 |
| x+y |
| xy |
| x2-y2 |
(
+
)/
=
•
=
.
故答案为
.
| 1 |
| x-y |
| 1 |
| x+y |
| xy |
| x2-y2 |
=
| x+y+x-y |
| x2-y2 |
| x2-y2 |
| xy |
=
| 2 |
| y |
故答案为
| 2 |
| y |
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题目内容
| 1 |
| x-y |
| 1 |
| x+y |
| xy |
| x2-y2 |
| 1 |
| x-y |
| 1 |
| x+y |
| xy |
| x2-y2 |
| x+y+x-y |
| x2-y2 |
| x2-y2 |
| xy |
| 2 |
| y |
| 2 |
| y |