计算m+2m/n-m + n/m-n - 2m/n-m

分类: 作业答案 • 2023-01-13 21:44:55

问题描述：

答

m+2m/n-m + n/m-n - 2m/n-m
=（m+2m-2m)/(n-m)+n/(m-n)
=m/(n-m)+n(m-n)
=-m/(m-n)+n/(m-n)
=-(m-n)/(m-n)
=-1