Пошаговое объяснение:

А)

1) 5. 2/5 * 3. 1/3 = 27/5 * 10/9 = 3/1 * 2/1 = 6/1 = 6

2) 6 - 13. 4/5 = -7. 4/5

3) -7. 4/5 : 1. 13/15 = -39/5 : 28/15 = -39/5 * 15/28 = -39/1 * 3/28 = -117/28 = -4. 5/28

4) -4. 5/28 + 3. 5/6 = -4. 15/84 + 3. 70/84 = -3. 99/84 + 3. 70/84 = -29/84

Ответ: -29/84

Б)

1) 2. 22/25 * 1. 13/24 = 72/25 * 37/24 = 3/25 * 37/1 = 111/25 = 4. 11/25

2) 7 - 4. 11/25 = 6. 25/25 - 4. 11/25 = 2. 14/25

3) 2. 14/25 : 6. 2/5 = 64/25 : 32/5 = 64/25 * 5/32 = 2/5 * 1/1 = 2/5

Ответ: 2/5