=12^(1/2)*(2/3)^(1/3)*12^(1/6)=12^(1/2+1/6)*(2/3)^(1/3)=12^(2/3)*(2/3)^(1/3)=(12^2)^(1/3)*(2/3)^(1/3)=144^(1/3)*(2/3)^(1/3)=(144*2/3)^(1/3)=96^(1/3)=三次根号下96