2 2/5*5/6-3/4*1 2/5. Дроби!!!!!!
2 2/5*5/6-3/4*1 2/5= 12/5*5/6=2 3/4*7/5=21/20=1,05 2-1,05=0,95
2 2/5*5/6-3/4*1 2/5=12/5*5/6-3/4*7/5=60/30-21/20=120/60-63/60=57/60