题目内容
计算:
(1)a-b+
(2)
÷(
-
).
(1)a-b+
| 2b2 |
| a+b |
(2)
| xy |
| x2-y2 |
| 1 |
| x-y |
| 1 |
| x+y |
(1)原式=
=
;
(2)原式=
÷
=
•
=
.
| (a-b)(a+b)+2b2 |
| a+b |
=
| a2+b2 |
| a+b |
(2)原式=
| xy |
| (x+y)(x-y) |
| x+y-x+y |
| (x+y)(x-y) |
=
| xy |
| (x+y)(x-y) |
| (x+y)(x-y) |
| 2y |
=
| x |
| 2 |
练习册系列答案
相关题目