(2 5\6-3 4\5*1 1\9):(-3,75)

(2 5/6 - 3 4/5 * 1 1/9) : (- 3,75) = 10/27

1) 3 4/5 * 1 1/9 = 19/5 * 10/9 = (19*2)/(1*9) = 38/9 = 4 2/9
2) 2 5/6 - 4 2/9 = 2 15/18 - 4 4/18 = - 1 7/18
3) - 1 7/18 : (- 3,75) = - 25/18 : (- 375/100) = 25/18 * 100/375 = (1*50)/(9*15) = 50/135 = 10/27