题目内容
计算或化简
(1)
-
;(2)1-
÷(
-
).
(1)
| b |
| a |
| a |
| b |
| a-1 |
| a |
| a |
| a+2 |
| 1 |
| a2+2a |
(1)原式=
;
(2)原式=1-
÷
=1-
×
=1-
=-
.
| b2-a2 |
| ab |
(2)原式=1-
| a-1 |
| a |
| (a+1)(a-1) |
| a(a+2) |
=1-
| a-1 |
| a |
| a(a+2) |
| (a+1)(a-1) |
=1-
| a+2 |
| a+1 |
=-
| 1 |
| a+1 |
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