m-n=4 m+n=-2
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=
如果m,n互为相反数,求m+2m+3m+4m+5m+5n+4n+3n+2n+n=多少
计算:1.[(m+n)(n-m)-(m+n)^2+3m(m+n)]除以(-2M),其中m=-4,n=2 2.(x+y)(
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))
n=m/M
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-n|=n-m,|m|=4|n|=3,则|(m+n)|^2=_______?
已知-m²+2m=4n,-n²+2n=4m,求m/n的值
3m+4n-[2m+(5m-2n)-3n]其中m=n分之一=2
1,已知3m=4n,则m/m+n +n/m-n -m^2/m^2-n^2=