Помогите дам 15-20 балловһ

Ответ:

Пошаговое объяснение:

4. 7/8 - 2. 1/5 = 4. 35/40 -

2. 8/40 = 2. 27/40

2. 1/3 - 3/5 = 2. 5/15 - 9/15 = 1. 20/15 - 9/15 = 1. 11/15

9. 4/7 + 3. 5/6 = 9. 24/42 + 3. 35/42 = 12. 59/42 = 13. 17/42

3. 2/5 - 3. 1/5 = 1/5

5 + 2. 2/7 = 7. 2/7

8. 3/4 - 7 = 1. 3/4

1. 5/6 + 4. 1/6 = 5. 6/6 = 6

9. 7/9 - 7. 6/7 = 9. 49/63 -

7. 54/63 = 8. 112/63 - 7. 54/63 = 1. 58/63