даю 70 балов! пожалуйста ​

Ответ:

-1 2/21

Пошаговое объяснение:

1) 2,5 - 2 1/3 = 2 1/2 - 2 1/3 = 2 3/6 - 2 2/6 = 1/6

2) 1/6 * (-5 1/7) = 1/6 * (-36/7) = 1/1 * (-6/7) = -6/7

3) 1 1/3 : (-5,6) = 4/3 : (-56/10) = 4/3 * (-10/56) = 1/3 * (-10/14) = -10/42 = -5/21

4) -6/7 + (-5/21) = -6/7 - 5/21 = -18/21 - 5/21 = -23/21 = -1 2/21