原式=[6√(3/4)-3√(1/3)+√18]+(√3-1)²=[6×√(3/2²)-3√(3/3²)+√(3²×2)]+√3²-2√3+1=[6×(√3)/2-3×(√3)/3+3√2]+3-2√3+1=3√3-√3+3√2+3-2√3+1=4+3√2