题目内容
化简:
(1)
+
(2)
•
.
(1)
| 2a |
| a2-4 |
| 1 |
| 2-a |
(2)
| a2-4b2 |
| 4ab2 |
| ab |
| a+2b |
(1)原式=
-
=
=
=
;
(2)原式=
•
=
.
| 2a |
| (a+2)(a-2) |
| 1•(a+2) |
| (a+2)(a-2) |
=
| 2a-a-2 |
| (a+2)(a-2) |
=
| a-2 |
| (a+2)(a-2) |
=
| 1 |
| a+2 |
(2)原式=
| (a+2b)(a-2b) |
| 4ab2 |
| ab |
| a+2b |
=
| a-2b |
| 4b |
练习册系列答案
相关题目