6 целых 11/12- 3 целых 11/6-1 целых 1/4

6 11/12 - 3 22/12 - 1 3/12 = 5 23/12 - 3 22/12 - 1 3/12 =  2 1/12 - 1 3/12 = 1 13/12 - 1 3/12 = 10/12 = 5/6