Ответ:

-194

Пошаговое объяснение:

1) -6 2/3 - 2 4/15 = -(6 10/15+2 4/15) = -8 14/15

2) -8 14/15 - 5 1/2 = -(8 28/30 + 5 15/30) = -13 43/30 = -14 13/30

3) -14 13/30 : 1/15 = -433/30 * 15/1 = -433/2 = -216,5

4) 30 : 5/28 = 30 * 28/5 = 168

5) -216,5 + 168 = -48,5

6) 2 3/4 * 3 19/22 = 11/4 * 85/22 = 85/8

7) 85/8 : 42 1/2 = 85/8 : 85/2 = 85/8 * 2/85 = 1/4

8) -48,5 : 1/4 = -48,5 : 0,25 = -194