已知2m-3n/3m+n=2 求(4m-6n/9m+3n)+(18m+6n/4m-6n)的值.要有步骤和讲解.
已知2m-3n/3m+n=2 求(4m-6n/9m+3n)+(18m+6n/4m-6n)的值.要有步骤和讲解.
已知2m-3n/3m+n=2,求4m-6n/9m+3n+18m+6n/4m-6n的值
已知m-n=6,求4(m-n)-3m+3n+8的值.
若m-n=3,3m+2n=2,求代数式6m(m-n)-4n(n-m)的值
计算(m+4n)(m-n)-6(m+2n)(m-3n)
(m+4n)(m-n)-6(m+2n)(m-3n),
(m+4n)(m-n)-6(m+2n)(m-3n)
已知:4m-n=70,2m+3n=6,求(m-2n)的平方-(3m+n)的平方的值
已知3n-2m-1=0,求,(1)6n-4m的值;(2)(m+n)-(3m-2n-7)的值
已知m^2-n=45,4m^2+6n+2/3=0,求2m^4+m^2n-3n^2的值.
已知m>0,n>0,m^2+n^2=5,mn=2求[6m^2-5m(-m+3n)+4m(-4m+5/2n)]×n的值
已知m/n=5、,求(m/(m+n))+(m/(m-n))-(n^2/(m^3-n^2))