(3m-n)(m-2n)=()

(m-n)^3(n-m)^2(m-n)=_____ (3m-n)(m-2n)=() 已知3m=2n,则m/(m+n)+n/(m-n)-n^2/(m^2-n^2)=? 已知3m=4n,则m/m+n+n/m-n-m^2/m^2-n^2= m/n=5/3,求（m/m+n）+（m/m+n)-（n^2/m^2-n^2) 已知m/n=5、,求（m/（m+n）)+(m/(m-n))-(n^2/(m^3-n^2)) (m-2n/n-m)-(n/m-n)= m-[n-3m-(m-n)]=? 2m+3n+2m+3n+m+2m+3n+n=______ (m-2n)(2n+m)-(-3m-4n)(4n-3m)= .4（m+n)^2*（m+n)^3-7（m+n)（m+n)^4+5（m+n)^5= m-{n-2m+[3m-(6m+3n)+5n]}= (m-n)(m+n)+(m+n)²-3=2m² [(m-n)^2*(m-n)^3]^2/(m-n)^4 [(m-n)^2*(m-n)^3]^2/(m-n)^4 m/n=7/3则m+n/m-n 3m(m-n)-2n(m-n)的平方 因式分解(n-m)^3(m-n)^2-(m-n)^5