{-3/2m+n=4 {2m+n=-3 求m,n 注意,

已知3m=4n,则m/m+n+n/m-n-m^2/m^2-n^2= (m-2n)(2n+m)-(-3m-4n)(4n-3m)= (m-n)^3(n-m)^2(m-n)=_____ .4（m+n)^2*（m+n)^3-7（m+n)（m+n)^4+5（m+n)^5= (3m-n)(m-2n)=() 已知3m=2n,则m/(m+n)+n/(m-n)-n^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)^2+(3m-n)(2m+2n)-(2m+n)(2m-n) 已知m+n=4 mn=1 如果m和n互为相反数,则m+2m+3m+4m+5m+5n+4n+3n+2n+n= 如果m,n互为相反数,求m+2m+3m+4m+5m+5n+4n+3n+2n+n=多少 2m+3n+2m+3n+m+2m+3n+n=______ (m+4)^2+|n+3|=01/2m-n [(m-n)^2*(m-n)^3]^2/(m-n)^4 [(m-n)^2*(m-n)^3]^2/(m-n)^4 4m(m-n)^2+4n(n-m)^3 （m-n)2(n-m)3(n-m)4化简 若(m-2n)/(2m+n)=3,则[3(m-2n)/(2m+n)-(m-2n)/[2(2m+n)] - {9(m-2n)/[4(2m+n)]}的值是?