-(2m-3)=?n-3(4-2m)=?a+5（-b-1)=?-(5m+n)-7(a-3b)

已知3m=4n,则m/m+n+n/m-n-m^2/m^2-n^2= (m-2n)(2n+m)-(-3m-4n)(4n-3m)= .4（m+n)^2*（m+n)^3-7（m+n)（m+n)^4+5（m+n)^5= (m-n)^3(n-m)^2(m-n)=_____ (3m-n)(m-2n)=() 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-n)(2m+2n)-(2m+n)(2m-n) 已知m+n=4 mn=1 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3m=2n,则m/(m+n)+n/(m-n)-n^2/(m^2-n^2)=? 2m+3n+2m+3n+m+2m+3n+n=______ -5m(-m+3n)+4m(-4m-5/2n),其中m=2,n=-1 2m(m-n)=4m(2m+3n) 2m(m+n)=4m(2m+3n) (m+4)^2+|n+3|=01/2m-n 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? 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