计算2m-n/n-m+m/m-n+n/n-m
问题描述:
计算2m-n/n-m+m/m-n+n/n-m
答
(2m-n)/(n-m)+m/(m-n)+n/(n-m)
=(2m-n)/(n-m)-m/(n-m)+n/(n-m)
=(2m-n-m+n)/(n-m)
=m/(n-m)
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