Пошаговое объяснение:

А)

1) -2. 1/6 - 3. 1/4 = -2. 2/12 - 3. 3/12 = = -5. 5/12

2) -5. 5/12 : 2. 3/5 = -65/12 : 13/5 = -65/12 * 5/13 = -5/12 * 5/1 = -25/12 = -2. 1/12

3) 2/3 * 2. 1/4 = 2/3 * 9/4 = 1/1 * 3/2 = 3/2 = 1. 1/2

4) -2. 1/12 + 1. 1/2 = -2. 1/12 + 1. 6/12 = -1. 13/12 + 1. 6/12 = -7/12

5) -7/12 - 5. 1/6 = -7/12 - 5. 2/12 = -5. 9/12 = -5. 3/4

Ответ: -5. 3/4

Б)

1) 3. 1/12 - 1. 5/8 = 3. 2/24 - 1. 15/24 = 2. 26/24 - 1. 15/24 = 1. 11/24

2) 7 : 1. 11/24 = 7 : 35/24 = 7 * 24/35 = 1 * 24/5 = 24/5 = 4. 4/5

3) -1. 1/10 - 4. 4/5 = -1. 1/10 - 4. 8/10 = -5. 9/10

4) -5. 9/10 * 1. 1/59 = -59/10 * 60/59 = -1/1 * 6/1 = -6/1 = -6

Ответ: -6