5-2÷16/3*4 =5-2×3/16×4=5-2/3=4又1/33/5÷【3/8÷（4/15+2/5）】=3/5÷【3/8÷10/15】=3/5÷【3/8×15/10】=3/5÷3/8÷15/10=3/5×8/3×10/15=1又1/15
