题目内容
计算:
+
-
.
| a-2-b-2 |
| a-1+b-1 |
| 1 |
| b |
| 1 |
| a |
考点:分式的加减法,负整数指数幂
专题:
分析:根据负整指数幂,可得
,根据分式的乘除,可得
-
,根据加法交换律、结合律,可得答案.
| ||||
|
| 1 |
| a |
| 1 |
| b |
解答:解:原式=
+
-
=
+
-
=
-
+
-
=(
-
)+(-
+
)
=0.
| ||||
|
| 1 |
| b |
| 1 |
| a |
=
(
| ||||||||
|
| 1 |
| b |
| 1 |
| a |
=
| 1 |
| a |
| 1 |
| b |
| 1 |
| b |
| 1 |
| a |
=(
| 1 |
| a |
| 1 |
| a |
| 1 |
| b |
| 1 |
| b |
=0.
点评:本题考查了分式的加减,利用了负整指数幂,加法运算律.
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