题目内容
(2012•德阳模拟)化简:
+
的结果是
.
1 |
x-1 |
2 |
1-x2 |
1 |
x+1 |
1 |
x+1 |
分析:首先通分,然后利用同分母的分式相加减的运算法则求解,即可求得答案,注意运算结果需化为最简.
解答:解:
+
=
-
=
=
=
.
故答案为:
.
1 |
x-1 |
2 |
1-x2 |
=
x+1 |
(x+1)(x-1) |
2 |
(x+1)(x-1) |
=
x+1-2 |
(x+1)(x-1) |
=
x-1 |
(x+1)(x-1) |
=
1 |
x+1 |
故答案为:
1 |
x+1 |
点评:此题考查了分式的加减运算法则.此题比较简单,注意运算结果需化为最简.
![](http://thumb2018.1010pic.com/images/loading.gif)
练习册系列答案
相关题目