6, 8 - 2 целых 1/3 + 1, 2
6,8 = 6 4/5 1,2 = 1 1/5 ------------------------ 6 4/5 - 2 1/3 + 1 1/5 = (6 4/5 + 1 1/5) - 2 1/3 = 8 - 2 1/3 = 5 2/3