3m+2n/4=m+5n/-3=m-3n/5

.4（m+n)^2*（m+n)^3-7（m+n)（m+n)^4+5（m+n)^5= 已知3m=4n,则m/m+n+n/m-n-m^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)) (m-2n)(2n+m)-(-3m-4n)(4n-3m)= (m-n)^3(n-m)^2(m-n)=_____ m-[n-3m-(m-n)]=? 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 (3m-n)(m-2n)=() 已知3m=2n,则m/(m+n)+n/(m-n)-n^2/(m^2-n^2)=? 2m-{n+[4m-3(m+2n)]}-5n其中m=2/3 n=-4 m-{n+[4m-3(m+2n)]}-5n其中m=2/3 n=-4 3m+4n-[2m+(5m-2n)-3n]其中m=n分之一=2 已知m/n=5/3,求m/(m+n)+m/(m-n)-n平方/(m平方-n平方) 3m+2n/4=m+5n/-3=m-3n/5 3m+2n/4=m+5n/-3=2m+n+2/5 若5m-3n=-4,求出2（m-n）+4(2m-n)