(m-2)^2+| n+2| =0
2x+n/m=m/n-(m/n+n/m)x(m+n不等于0)
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*m=n+2,n*n=m+2.求m*m*m-2mn+n*n*n(m不等于n).
已知|2m-n/m+2n|=3,求2(2m-n)/m+2n-2m-n/m+2n-3的值
若2m-n/m+2n=5,求3(2m-n)/m+2n-m+2n/2m-n+3的值
已知2m-5n=0,求值:(1+n/m-m/m-n)÷(1-n/m-m/m+n)
(1)已知|2m-5|+(2m-5n+20)²=0,求(m-n)²-(2m+n)(n-m)
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)
已知3m=2n,则m/(m+n)+n/(m-n)-n^2/(m^2-n^2)=?
化简m/(m+n)²+n/m²-n²-2n²/(m+n)(m²-n
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)