Ответ:

3

Пошаговое объяснение:

7/15 = 56/120. 3/40 = 9/120. 1/24 = 5/120

7/15 - 3/40 - 1/24 = 56/120 - 9/120 - 5/120 = 42/120

42/120 : 0,7 = 6/12 = 0,5

2,4 * 1/3 - 3 = 0,8 - 3 = -2,2

-2,2 * 5/11 = -1

1 5/6 = 11/6. 1 2/3 = 5/3

3/4 = 9/12. 5/3 = 20/12

9/12 - 20/12 = -11/12

11/6 : (-11/12) = -12/6 = -2

4/9 = 16/36. 5/12 = 15/36. 0,75 = 27/36

16/36 - 15/36 + 27/36 = 28/36 = 14/18 = 7/9

7/9 * 3/7 = 3/9 = 1/3

0,5 : (-1) * (-2) : 1/3 = -0,5 * (-6) = 3