若2^m=3,4n=8,则2^3m-2n+3的值为多少 知道的说下、谢谢 ◇寂灬筱喧◆

已知3m=4n,则m/m+n+n/m-n-m^2/m^2-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? 已知3m=2n,则m/(m+n)+n/(m-n)-n^2/(m^2-n^2)=? 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 m+2n=2,3m+4n=8,则m=?,n=? (m-2n)(2n+m)-(-3m-4n)(4n-3m)= 如果m和n互为相反数,则m+2m+3m+4m+5m+5n+4n+3n+2n+n= (m-n)^3(n-m)^2(m-n)=_____ .4（m+n)^2*（m+n)^3-7（m+n)（m+n)^4+5（m+n)^5= (3m-n)(m-2n)=() 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 |m-n|=n-m,|m|=4|n|=3,则|(m+n)|^2=_______? 若m^2-n^2=6,且m-n=3,则m+n=? m+2n=2,3m+4n=8,求m+n=几 若m+n=0,则多项式m^3-m^3n-mn^2+n^3