已知 4m-3n-6e=0,m+2n-7e=0,求2m^2+3n^2+6e^2/m^2+5n^2+7e^2
已知 4m-3n-6e=0,m+2n-7e=0,求2m^2+3n^2+6e^2/m^2+5n^2+7e^2
e的m次方=3 In2=n 求e(2m+3n)次方
已知m/n=5、,求(m/(m+n))+(m/(m-n))-(n^2/(m^3-n^2))
已知3n-2m-1=0,求,(1)6n-4m的值;(2)(m+n)-(3m-2n-7)的值
已知m=5 4/7,n=4 3/7, 求代数式[-7/2(m+n)]^3×(m-n)×[-2(m+n)(m-n)]^2的
已知:3m-5n=0,求m/(m+n)+m/(m-n)-m^2/(m^2-n^2)的值
已知3m-5n=0求m/m+n+m/m-n-m^2/m^2-n^2的值
如果m-3n+4=0 求(m-3n)^2+7m^3-3(2m^3n-m^2n-1)+3(m^3+2m^3n-m^2n+n
已知m^2+n^2-6m+10n+34=0,求m-n
已知|2m-5|+(2m-5n+20)^2=0,求(-2m^2)-2m(5n-2m)+3n(6m-5n)-3n(4m-5
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 |2m-5|+(2m-5n+20)的平方=0 求-2m的平方-2m(5n-2m)+3n(6m-5n)-3n(4m-