题目内容
计算:
+
-
.
1 |
a |
1 |
b |
2a+b |
2ab |
分析:先通分,再把分子相加减即可.
解答:解:原式=
+
-
=
=
=
=
.
2b |
2ab |
2a |
2ab |
2a+b |
2ab |
=
2b+2a-(2a+b) |
2ab |
=
2b+2a-2a-b |
2ab |
=
b |
2ab |
=
1 |
2a |
点评:本题考查的是分式的加减法,异分母分式的加减就转化为同分母分式的加减.
练习册系列答案
相关题目