11 2/9-(3 17/19+6 14/ 19)

11 2/9 - (3 17/19 + 6 14/19) = 11 2/9 - (10 31/19) = 11 2/9 - (10 + 31/19) = 11 2/9 - (190/19 + 31/19) = 11 2/9 - 221/19 = (209/9 + 2) - (221/19) = (1881/9 + 18/9) - (221/19) = 209/9 - 221/19 = (20919 - 2219) / (9*19) = (3971 - 1989) / 171 = 2082 / 171 = 12 60/171 = 12 20/57

Ответ: 12 20/57