m+2n=2,3m+4n=8,求m+n=几
m+2n=2,3m+4n=8,求m+n=几
已知m/n=5、,求(m/(m+n))+(m/(m-n))-(n^2/(m^3-n^2))
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
{-3/2m+n=4 {2m+n=-3 求m,n 注意,
5m+3n=8 5m-3n=2,求m+n
已知3m=2n,则m/(m+n)+n/(m-n)-n^2/(m^2-n^2)=?
已知|2m-n/m+2n|=3,求2(2m-n)/m+2n-2m-n/m+2n-3的值
若2m-n/m+2n=5,求3(2m-n)/m+2n-m+2n/2m-n+3的值
诺2m-n/m+2n=5,求3(2m-n)/m+2n-m+2n/2m-n+3的值
已知m-2n/2m+n=5,求代数式3(m-2n)/2m+n-15(2m+n)/m-2n-2
当m-n/m+n=3时,求代数式(3m+3n/m-n)-(m-n/m+n)^2的值为多少?