3целых 3/12 + 5/12 = 3 8/12 = 43целых 3/12 + 1целая 5/12 = 4 8/12 = 53целых 3/12 + 11/12 = 3 14/12 = 43целых 3/12 + 1 целая 11/12 = 4 14/12 = 5