原式=√18-6+√2/3=3√2-6+√2/3=10√2/3-6
8√2/3-6
(√3-√6)X√6+√2/3=√(3*3*2)-√(6*6)+√2/3=3√2+√2/3-6=(3+1/3)√2-6=10√2/3-6
3+1/3=10/3