m+2n=2,3m+4n=8,求m+n=几

m/n=5/3,求（m/m+n）+（m/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)) m+2n=2,3m+4n=8,求m+n=几 m+2n=2且3m+4n=8,求m+n 如果m,n互为相反数,求m+2m+3m+4m+5m+5n+4n+3n+2n+n=多少 已知3m=4n,则m/m+n+n/m-n-m^2/m^2-n^2= 4m+2n=8,求m、n (m-2n)(2n+m)-(-3m-4n)(4n-3m)= (m-n)^3(n-m)^2(m-n)=_____ (m-2n/n-m)-(n/m-n)= lm+n-3l+m^2n^2+4mn+4=0 求(4m-n)(m-2n)-(n-m）(-m-n) (m-n)^2*(m-n)^4=? {-3/2m+n=4 {2m+n=-3 求m,n 注意, (3m-n)(m-2n)=() 5m+3n=8 5m-3n=2,求m+n m-n=4,m^2-n^2=24,求(m+n)^3的值 根号(m+2n)+根号(3m-2n-8)=0求m ,n m^2+n^2+1=mn+m+n,求3m-4n