若m=2n+3,则4m=
若(m-2n)/(2m+n)=3,则[3(m-2n)/(2m+n)-(m-2n)/[2(2m+n)] - {9(m-2n
如果m和n互为相反数,则m+2m+3m+4m+5m+5n+4n+3n+2n+n=
已知3m=2n,则m/(m+n)+n/(m-n)-n^2/(m^2-n^2)=?
1,已知3m=4n,则m/m+n +n/m-n -m^2/m^2-n^2=
若m+2=n-3,则m-4=
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-n|=-(m-n),且|m|=4,|n|=3,则m=();n=();
|m-n|=n-m,|m|=4|n|=3,则|(m+n)|^2=_______?
m+2n=2,3m+4n=8,则m=?,n=?
若m×m+n×n-6n+4m+13=0,则m×m-n×n=?
若m^2+n^2-6n+4m+13=0则m-n=?
若|M-N+2|+(M+N-4)的二次方等于零,则M=?,N=?