若2m-3n=2,2m+3n=-1,则3(2m+3n)-2(2m-3n)=
若(m-2n)/(2m+n)=3,则[3(m-2n)/(2m+n)-(m-2n)/[2(2m+n)] - {9(m-2n
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))
设m n为自然数,定义m*n=m+(m+1)+(m+2)+(m+3)+.(m+n)
若2m-n/m+2n=5,求3(2m-n)/m+2n-m+2n/2m-n+3的值
如果m和n互为相反数,则m+2m+3m+4m+5m+5n+4n+3n+2n+n=
1,已知3m=4n,则m/m+n +n/m-n -m^2/m^2-n^2=
若m+n=0,则多项式m^3-m^3n-mn^2+n^3
已知m-3n=2m+n-15=1,则m=?,n=?
若|m-n|+(m+2n-3)²=0,则m+n的值是
若m、n互为相反数,则(5m-3n)-(2m-6n)=
[(m-n)^2*(m-n)^3]^2/(m-n)^4