Б) -3,24 + 4,76 + 2,9 = 4,42
В) 2 7/15 - 2 2/15 + 8 1/9 = 37/15 - 32/15 + 73/9 = 111/45 - 96/45 + 365/45 = 380/45 = 76/9 = 8 4/9