(4/5 + 1/6) * ( 23 целых 2/3 - 15 целых 5-9 ) * 45/58 - 1/2

(4/5+1/6)(23 2/3-15 5/9)45/58-1/2=(24/30+5/30)(23 6/9-15 5/9)845/58-1/2=29/30(8 1/9)45/58-1/2=(2945)/(3058)73/9-1/2=3/4*73/9-1/2=73/12-1/2=67/12=5 7/12