2m-n=-7 5m-3n=2 求m

已知m/n=5、,求（m/（m+n）)+(m/(m-n))-(n^2/(m^3-n^2)) 若2m-n/m+2n=5,求3（2m-n）/m+2n-m+2n/2m-n+3的值 诺2m-n/m+2n=5,求3(2m-n)/m+2n-m+2n/2m-n+3的值 已知m-2n/2m+n=5,求代数式3(m-2n)/2m+n－15(2m+n)/m-2n－2 如果m,n互为相反数,求m+2m+3m+4m+5m+5n+4n+3n+2n+n=多少 已知m=5 4/7,n=4 3/7, 求代数式[-7/2(m+n)]^3×(m-n)×[-2(m+n)(m-n)]^2的 已知：3m-5n=0,求m/(m+n)+m/(m-n)-m^2/(m^2-n^2)的值 已知3m-5n=0求m/m+n+m/m-n-m^2/m^2-n^2的值 已知m-2n=3.求[(3m+2n)(3m-2n)-(m+2n)(5m-2n)]÷1/3 m 的值. 在线等已知m/n=5/3,求m/(m+n)+m/(m-n)-n^2/(m^2-n^2)... 已知m/n=5/3,求分式m/(m+n)+m/(m-n)-n^2/(m^2-n^2)的值 已知m/n = 5/3 求m/(m+n)+m/(m-n)-n^2/(m^2-n^2)等于多少?（要化简全过程）