将分式M的平方+2Mn分之n乘以2n的平方-mn分之m乘以m的平方-4n的平方分之mn通分后的结果分别是

n/(m²+2mn)=n/[m(m+2n)]m/(2n²-mn)=-m/[n(m+2n)]2mn/(m²-4n²)=2mn/[(m+2n)(m-2n)]所以n/(m²+2mn)=n²(m-2n)/[mn(m+2n)(m-2n)]m/(2n²-mn)=-m²(m-2n)/[mn(m+2n)(m-2n)]2mn/(m&...