2根6-1/2*根3-2根号(2/3)-1/6*根12-6根号(1/6)=2根6-1/2*根3-2/3*根号6-1/3*根3-根号6=(2-2/3-1)根号6-(1/2+1/3)根号3=1/3*根号6-5/6*根号3