Ответ:(5/14 + 10/21) = (15+20)/42 = 35/42 = 5/61 1/6 = 7/6(13/22 - 25/33) = (39-50)/66 = -11/66 = -1/6(5/6) · (3/5) + (7/6) : (-1/6) = 1/2 + (-7) = -6.5