3根号2分之1=3×√(1/2)=3× √2 ×√ [ (1/2)×2 ]=3×√2×√¼=(3√2)/2.
根号2不能再化简了.
根号3分之2=√(2/3)=√ [(3×2)/(3×3)]=√(6/9)=(1/3)×√6,或者写成=(√6)/3.