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