2/[(根号6+2/根号2)/4]=2/[(根号6+根号2)/4]=8/(根号6+根号2)
=8(根号6-根号2)/[(根号6+根号2)(根号6-根号2)]
=8(根号6-根号2)/4
=2(根号6-根号2)
=2根号2(根号3-1)