若2m+n=25,m-2n=2,则(m+3n)^2-(3m-n)^2=

若（m+n)(m-n)^2-mn(m+n)=(m+n)·M,则M是 (m-2n/n-m)-(n/m-n)= 已知3m=4n,则m/m+n+n/m-n-m^2/m^2-n^2= 已知3m=2n,则m/(m+n)+n/(m-n)-n^2/(m^2-n^2)=? 已知m+n=2012(m-n),则m+n/2(m-n)=? 若|m|=4,|n|=1/2 1,若m+n>m-n,则m+n=?2,若|m+n|=|m|+|n|若|m|=4,|n|=1/21,若m+n>m-n,则m+n=?2,若|m+n|=|m|+|n|,则m、n的值分别是： (m-n)^3(n-m)^2(m-n)=_____ 若(m+n)^2-mn(m+n)=(m+n)·M,则M是（） A.m^2+n^2 B.m^2-mn+n^2 C.m^2-3mn+n^2 D.m^2+mn+n^2 1若m=n,则|m|=|n|;2若m=—n,则|m|=|n|;3若|m|=|n|,则m=—n;4若|m|=|n|,则m=n哪个对 若(m-2n)/(2m+n)=3,则[3(m-2n)/(2m+n)-(m-2n)/[2(2m+n)] - {9(m-2n)/[4(2m+n)]}的值是? (3m-n)(m-2n)=() (m-n)^2*(m-n)^4=? 若m,n满足m+2n=8,2m+n=7,则m+n= 若M.N满足{M+2N=8,2M+N=7}则M减去N=? 若|m-n|=n-m,且|m|=4、|n|=3,则（m+n)^2= 若|m-n|=n-m,且|m|=4,|n|=3,则(m+n)^2=? 若有理数m,n满足m-2n=4,2m-n=3,则m+n等于 若实数m n 满足(m+n)(m+n-2)-8=0 则m+n=?