Вычислите: (-2,5 + 2 5/6) : 1 5/9 + 7,6 : (-1 4/15)

-2.5 = -5/2. 2 5/6 = 17/6. 1 5/9 = 14/9. 7.6 = 76/10 = 38/5. -1 4/15 = -19/15.
(-5/2 + 17/6) : 14/9 + 38/5 : (-19/15) = (-15/6 + 17/6) : 14/9 + 38/5 * (-15/19) = (2/6) : 14/9 + (-6) = 1/3 * 9/14 - 6 = 3/14 - 6 = 3/14 - 84/14 = -81/14 = -5 11/14