Question

通分:m-n分之a,3(n-m)分之b,m的平方-2mn+n的平方分之c

Answer 1

最简公分母是3(m-n)²

a/(m-n)=3a(m-n)/3(m-n)²

b/3(n-m)=-b/3(m-n)=-b(m-n)/3(m-n)²

c/(m²-2mn+n²)=c/(m-n)²=3c/3(m-n)²