Ответ:

Пошаговое объяснение:

- 81/88 * (-6 + (-1 13/15) * (-1 19/21))

- 1 13/15 * (-1 19/21) = -28/15 * (-40/21) = 224/63

-6 + 224/63 = -22/9

-81/88 * (-22/9) = 9/4 = 2 1/4

(-4/5 - 4/7) * (5 7/9 - 7 11/12)

-4/5 - 4/7 = -48/35

5 7/9 - 7 11/12 = 52/9 - 95/12 = -77/36

-48/35 * (-77/36) = 44/15 = 2 14/15