题目内容
化简:
(1)(xy-y2)÷
•
;
(2)
÷
.
(1)(xy-y2)÷
| x2-2xy+y2 |
| xy |
| x-y |
| x2 |
(2)
| a-1 |
| a-2 |
| a2-2a+1 |
| 2a-4 |
(1)原式=y(x-y)•
•
=
;
(2)原式=
•
=
.
| xy |
| (x-y)2 |
| x-y |
| x2 |
| y2 |
| x |
(2)原式=
| a-1 |
| a-2 |
| 2(a-2) |
| (a-1)2 |
| 2 |
| a-1 |
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