若:-8*16=-2^m 3*(-27)=-9^n 则:5m-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)=?
若m、n互为相反数,则(5m-3n)-(2m-6n)=
已知m/n=5、,求(m/(m+n))+(m/(m-n))-(n^2/(m^3-n^2))
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=
若:-8*16=-2^m 3*(-27)=-9^n 则:5m-3n=
若5m=-3n 则m :n=
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)
m+2n=2,3m+4n=8,则m=?,n=?
5m+3n=8 5m-3n=2,求m+n
若m+n=0,则多项式m^3-m^3n-mn^2+n^3