一道七年级分式加减题

分类: 作业答案 • 2023-01-21 16:51:13

问题描述：

一道七年级分式加减题
(x+1-1/1-x)÷(x-x2/x-1)

答

原式=[(x+1)+1/(x-1)]÷[-(x²-x)/(x-1)]
=[(x²-1+1)/(x-1)]÷[-x(x-1)/(x-1)]
=[x²/(x-1)]÷(-x)
=-x/(x-1)