题目内容
计算:(1)
+
(2)
÷
.
| 2 |
| a2-1 |
| 1 |
| 1-a |
(2)
| x2-2xy+y2 |
| x2y-xy2 |
| x2-y2 |
| xy |
(1)原式=
-
=
=-
;
(2)原式=
×
=
.
| 2 |
| (a+1)(a-1) |
| a+1 |
| (a+1)(a-1) |
| 2-a-1 |
| (a+1)(a-1) |
| 1 |
| a+1 |
(2)原式=
| (x-y)2 |
| xy(x-y) |
| xy |
| (x+y)(x-y) |
| 1 |
| x+y |
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