4m-2n=5,2m+5n=-8
已知m/n=5、,求(m/(m+n))+(m/(m-n))-(n^2/(m^3-n^2))
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
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)
3m+4n-[2m+(5m-2n)-3n]其中m=n分之一=2
m^+4m+n^-2n+5=0,求4m+5n=?
5m+3n=8 5m-3n=2,求m+n
若5m-3n=-4,求出2(m-n)+4(2m-n)
m平方+2M+N平方-4N+5=0,求M,N
m-{n-2m+[3m-(6m+3n)+5n]}=
已知m=5 4/7,n=4 3/7, 求代数式[-7/2(m+n)]^3×(m-n)×[-2(m+n)(m-n)]^2的
5(m-2n)方-3(m+n)+2(m+n)-8(m-2n)方,其中m=-10,n=-6时,怎么算