题目内容
计算
(1)(x+y)•
+
(2)(
+
)÷
.
(1)(x+y)•
| x2 |
| x2-y2 |
| y 2 |
| y-x |
(2)(
| x+2 |
| x-2 |
| 4 |
| x2-4x+4 |
| x |
| x-2 |
(1)原式=
-
=
=x+y;
(2)原式=
•
=
•
=
.
| x2 |
| x-y |
| y2 |
| x-y |
| (x+y)(x-y) |
| x-y |
(2)原式=
| x2-4+4 |
| (x-2)2 |
| x-2 |
| x |
| x2 |
| (x-2)2 |
| x-2 |
| x |
| x |
| x-2 |
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