首页 > 留学知识库

问题: 计算.化简

1.
(x+1- 8/x-1)÷x+3/x-1
2.
(1/y-1/x)·xy/x^2-y^2

解答:

解:1、(x+1- 8/x-1)÷x+3/x-1
=x-3 (且x不等于1,-3)
2、(1/y-1/x)·xy/x^2-y^2
=1/(x+y) (且x不等于y)