m+n/2-2m-n/8=2 2m+m-3n/7=-6 二元一次方程

(m-2n/n-m)-(n/m-n)= (1),(-m-n)(-m+n) (2),(-m+n)(m-n) (m-2n)(-m-n) 2(m-n)²-m(m-n) (m-n)^9乘(n-m)^8/(m-n)^2 (m-n)^3(n-m)^2(m-n)=_____ （m-n)(m+n)+(m+n)²-2m² (m-n)(m-n+2)-8因式分解 (3m-n)(m-2n)=() (m-n)^2*(m-n)^4=? m-n+2n^2/(m+n) mn(m-n)-m(n-m)²2m(m-n)(2n-m)求过程 计算m+2m/n-m + n/m-n - 2m/n-m 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+n/4m^-n^-m-2m/n^-4m^= 计算m+2n/n-m+n/m-n-2m/n-m