3 1/9 : 2 1/3 - 2 5/6
3 1/9 : 2 1/3 - 2 5/6 = 28/9 : 7/3 - 17/6 = 28/9 × 3/7 - 17/6 = 4/3 - 17/6 = 8/6 - 17/6 = -9/6 = -1,5 Ответ: -1,5