对实数a、b、c、d、e、f，有：5*((a*b*c*d-e*f)^2+(a*b*c*e-d*f)^2+(a*b*c*f-d*e)^2+(a*b*d*e-c*f)^2+(a*b*d*f-c*e)^2+(a*b*e*f-c*d)^2+(a*c*d*e-b*f)^2+(a*c*d*f-b*e)^2+(a*c*e*f-b*d)^2+(a*d*e*f-b*c)^2+(b*c*d*e-a*f)^2+(b*c*d*f-a*e)^2+(b*c*e*f-a*d)^2+(b*d*e*f-a*c)^2+(c*d*e*f-a*b)^2)>=3*((a*b*c-d*e*f)^2+(a*b*d-c*e*f)^2+(a*b*e-c*d*f)^2+(a*b*f-c*d*e)^2+(a*c*d-b*e*f)^2+(a*c*e-b*d*f)^2+(a*c*f-b*d*e)^2+(a*d*e-b*c*f)^2+(a*d*f-b*c*e)^2+(a*e*f-b*c*d)^2)．
