m^2+n^2=6n-4m-13,则m^2-n^2=?
m^2+4m+n^2-6n+13=0,则m+n=
若m^2+n^2-6n+4m+13=0则m-n=?
已知3m=2n,则m/(m+n)+n/(m-n)-n^2/(m^2-n^2)=?
若(m-2n)/(2m+n)=3,则[3(m-2n)/(2m+n)-(m-2n)/[2(2m+n)] - {9(m-2n
先化简,在求值(m+n)(m-n)(-m^2-n^2)-(-2m+n)(-2m-n)(4m^2+n^2) 其中m=1,n
如果m和n互为相反数,则m+2m+3m+4m+5m+5n+4n+3n+2n+n=
若x^2+n^2—6n+4m+13=0,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)
1、已知(m-n)^2=8,(m+n)^2=2,则m^2+n^2= 2、m^2+n^2=6n-4m-13,则m^2-n^
[(m+n)(m-n)-(m-n)²+2n(m-n)]÷4n
1,已知3m=4n,则m/m+n +n/m-n -m^2/m^2-n^2=
|m-n|=n-m,|m|=4|n|=3,则|(m+n)|^2=_______?