Ответ:

Пошаговое объяснение:

7/9 + 3. 2/9 = 3 + (7+2)/9 = 3 + 11/9 =

3 + 1. 2/9 = 4. 2/9

9 - 5. 1/4 = 8. 4/4 - 5. 1/4 = (8-5) + (4-1)/4 = 3 + 3/4 = 3. 3/4

1. 7/8 + 2. 6/8 = (1+2) + (7+6)/8 = 3 + 13/8 = 3 + 1. 5/8 = 4. 5/8

4. 5/7 - 1. 6/7 = (4-1) + (7+5)/7 - 1. 6/7 =

3. 12/7 - 1. 6/7 = (3-1) + (12-6)/7 = 2 + 6/7 =

2. 6/7