5/3-[（3.62*2/15+6.38*2/15）*1.82-4/3*0.82]
=5/3-[(3.62+6.38)*2/15*1.82-4/3*0.82]
=5/3-[10*2/15*1.82-4/3*0.82]
=5/3-[4/3*1.82-4/3*0.82]
=5/3-4/3
=1/3