3 m=5 3 n=7 3 n+m= 3 3n-2n=3 m=5 3 n=7 3 n+m= 3 3n-2n=

m/n=7/3则m+n/m-n m-[n-3m-(m-n)]=? .4（m+n)^2*（m+n)^3-7（m+n)（m+n)^4+5（m+n)^5= 已知m/n=5/3,求m/(m+n)+m/(m-n)-n平方/(m平方-n平方) 已知m/n=5、,求（m/（m+n）)+(m/(m-n))-(n^2/(m^3-n^2)) m/n=5/3,求（m/m+n）+（m/m+n)-（n^2/m^2-n^2) (m-n)^3(n-m)^2(m-n)=_____ 已知n/m=3/5,求m+n/m (3m-n)(m-2n)=() 已知m/n=5/3 求(1/m+n+1/m-n)÷1/n-n/m-n÷m+n/n的值,今天就要 已知：m/n=5/3,求（1/m+n+1/m-n)÷1/n-n/m-n÷m+n/n的值 3m+2n=7 3m-n=5m=?n=? 已知3m=2n,则m/(m+n)+n/(m-n)-n^2/(m^2-n^2)=? 已知3m=4n,则m/m+n+n/m-n-m^2/m^2-n^2= m-{n-2m+[3m-(6m+3n)+5n]}= 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 若2m-n/m+2n=5,求3（2m-n）/m+2n-m+2n/2m-n+3的值