(6-2/3+1/2)-(5+5/3-3/2)-(3-7/3+5/2)
=6-2/3+1/2-5-5/3+3/2-3+7/3-5/2
=36/6-4/6+3/6-30/6-10/6+9/6-18/6+14/6-15/6
=32/6+3/6-30/6-10/6+9/6-18/6+14/6-15/6
=35/6-30/6-10/6+9/6-18/6+14/6-15/6
=5/6-10/6+9/6-18/6+14/6-15/6
=-5/6+9/6-18/6+14/6-15/6
=4/6-18/6+14/6-15/6
=-14/6+14/6-15/6
=0/6-15/6
=-15/6=-5/2
Chúc bạn học tốt!!!