(6целых 8/15-4целых 21/45)*4,5-2целых 1/6: 0,52

(6 8/15 - 4 21/45) * 4,5 - 2 1/6 : 0,52 = (98/15 - 201/45) * 4,5 - 13/6 : 52/100 = (294/45 - 201/45) * 45/10 - 13/6 * 100/52 = 93/45 * 45/10  -  13/6 * 100/52 = 93/10 - 50/12 = 558/60 - 250/60 = 308/60 = 5 2/15