原式=(1/3)×[√108-√(9/2)]-[3√(1/3)-4√(1/2)]
=(1/3)×[√(36×3)-√9/√2]-3√1/√3+4√1/√2
=(1/3)×(√36×√3-3/√2)-3/√3+4/√2
=(1/3)×(6√3-3√2/√2²)-√3²/√3+4√2/√2²
=(1/3)×[6√3-(3√2)/2]-√3+2√2
=2√3-√2-√3+2√2
=√3+√2