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Ответ:

21

Пошаговое объяснение:

(-7,7 - 7,3) * ((-7/25 : (-6,3) + (-2,6) : 1 4/5)) =

-15 * (2/45 + (-1 4/9) = -15 * (-1 2/5) = 21

1. -7,7 - 7,3 = -15

2. -7/25 : (-6,3) = -7/25 : (-63/10) = 7/25 * 10/63 = 2/45

3. -2,6 : 1 4/5 = -26/10 : 9/5 = -26/10 * 5/9 = -13/9 = - 1 4/9

4.  2/45 + (-1 4/9) = 2/45 - 13/9 = -63/45 = -1 18/45 = -1 2/5

5. -15 * (-1 2/5) = -15 * (-7/5) = 21