3又1/5÷[(5/6-1/2)×1又1/5]=16/5÷(1/3×6/5)=16/5÷2/5=16/5×5/2=8
(5/6-1/2)*(1+1/5)÷(3+1/5)=1/3*6/5÷16/5=2/5*5/16=1/8