m/2+n/3=13 m/3-n/4=3 这是一道题解方成组

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)= (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)=() m-[n-3m-(m-n)]=? 已知3m=2n,则m/(m+n)+n/(m-n)-n^2/(m^2-n^2)=? 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)) 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 (m-2n)^2+(3m-n)(2m+2n)-(2m+n)(2m-n) 已知m+n=4 mn=1 7m+2n/5(m+n) ：4m+13n/3（m+n）=183：385怎么做到结果得m:n=3： 2m+3n+2m+3n+m+2m+3n+n=______ |m-n|=n-m,且|m|=4,|n|=3,则m+n=? |m-n|=n-m,且|m|=4,|n|=3,求（m+n)*(m+n)的值 (m+4)^2+|n+3|=01/2m-n 4m(m-n)^2+4n(n-m)^3