已知m+n=5,m^2-n^2=15,则m-n与m^2-n^2的值分别是?
已知3m=2n,则m/(m+n)+n/(m-n)-n^2/(m^2-n^2)=?
已知:2m-5n=0 求下式的值 (1+n/m-m/m-n)/(1+n/m-m/m-n)
已知m/n=5、,求(m/(m+n))+(m/(m-n))-(n^2/(m^3-n^2))
已知m-2n=3.求[(3m+2n)(3m-2n)-(m+2n)(5m-2n)]÷1/3 m 的值.
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|2m-n/m+2n|=3,求2(2m-n)/m+2n-2m-n/m+2n-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
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/=5,/n/=2,/m-n/=n-m,则m+n的值是( ) a-7 b-3
若|m-n|+(m+2n-3)²=0,则m+n的值是
已知m-mn=21,mn-n=15,求m-n与m-2mn+n的值.