Помогите решить пример:1 целая 7/12-5/18
1 7/12 - 5/18 = 19/12 - 5/18 = (19 × 3 - 5 × 2)/36 = 57/36 - 10/36 = 47/36 = 1 11/36
будет 1 целая 11/36
17/12 - 5/18 = 1 + 7/12 - 5/18 = 1 + 21/36 - 10/36 = 1 + 21 - 10/36 = 1 11/36