(10/3+5/2×1/2):5/3-7/4=
=(10/3+5/4):5/3-7/4=
=(40/12+15/12):5/3-7/4=
=55/12:5/3-7/4=
=55/12×3/5-7/4=
=11/4-7/4=
=4/4=1