已知8^n=5,9^m=2,则(2^3n×3^2m)²
已知3m=2n,则m/(m+n)+n/(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))
已知2m+n分之m-2n=3,则2m+n分之3(m-2n)+3(2m+n)分之m-2n-4(2m+n)分之5(m-2n)
若(m-2n)/(2m+n)=3,则[3(m-2n)/(2m+n)-(m-2n)/[2(2m+n)] - {9(m-2n
已知m-2n/2m+n=5,求代数式3(m-2n)/2m+n-15(2m+n)/m-2n-2
已知m-3n=2m+n-15=1,则m=?,n=?
已知m-2n=3.求[(3m+2n)(3m-2n)-(m+2n)(5m-2n)]÷1/3 m 的值.
1,已知3m=4n,则m/m+n +n/m-n -m^2/m^2-n^2=
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)
已知:3m-5n=0,求m/(m+n)+m/(m-n)-m^2/(m^2-n^2)的值