5/9+3又1/6÷(3又1/4-1又2/3)×1又1/2=5/9+19/6*12/19*3/2=5/9+3=3又5/93.5×1又1/4+1.25×27/10+3.8/(4/5)=1.25*(3.5+2.7+3.8)=1.25*10=12.53.2/【(2又3/4-19/36)/(1/5+30%)』】=3.2/(40/9)=0.72