9(m+n)^2-16(m-n)^2=?
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).
2x+n/m=m/n-(m/n+n/m)x(m+n不等于0)
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
化简m/(m+n)²+n/m²-n²-2n²/(m+n)(m²-n
已知:2m-5n=0 求下式的值 (1+n/m-m/m-n)/(1+n/m-m/m-n)
计算(3-m+n)*(3+m-n)-(2-m+n)*(2+m-n)
(3m-4n)(4n+3m)-(2m-n)(2m+n)
-(m+n)^2+6(m+n)-9
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