|m-n+2|+2m+n+4=0 m=?n=?
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
2x+n/m=m/n-(m/n+n/m)x(m+n不等于0)
已知3m=2n,则m/(m+n)+n/(m-n)-n^2/(m^2-n^2)=?
|m-n+2|+2m+n+4=0 m=?n=?
m^2+4m+n^2-6n+13=0,则m+n=
若m^2+n^2-6n+4m+13=0则m-n=?
m^+4m+n^-2n+5=0,求4m+5n=?
m平方+2M+N平方-4N+5=0,求M,N
已知m/n=5、,求(m/(m+n))+(m/(m-n))-(n^2/(m^3-n^2))
如果m-3n+4=0 求(m-3n)^2+7m^3-3(2m^3n-m^2n-1)+3(m^3+2m^3n-m^2n+n
如果m和n互为相反数,则m+2m+3m+4m+5m+5n+4n+3n+2n+n=
如果m,n互为相反数,求m+2m+3m+4m+5m+5n+4n+3n+2n+n=多少