题目内容
计算:
(1)
÷
(2)
-
.
(1)
| a2-b2 |
| a2+2ab+b2 |
| 2a-2b |
| a+b |
(2)
| 2x |
| x2-4 |
| 1 |
| x-2 |
(1)原式=
•
=
;
(2)原式=
=
=
.
| (a+b)(a-b) |
| (a+b)2 |
| a+b |
| 2(a-b) |
| 1 |
| 2 |
(2)原式=
| 2x-(x+2) |
| (x+2)(x-2) |
| x-2 |
| (x+2)(x-2) |
| 1 |
| x+2 |
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