4÷2/3-0.6
=4×3/2-6
=6-6
=0
2/9*0.375÷6/73
=2/9×3/8×73/6
=73/72
(1-1/100*60)÷2/5
=(1-3/5)÷2/5
=2/5÷2/5
=1