Ответ:

Пошаговое объяснение:

1) = 5 20/28 + 1 21/28 =

6 41/28 = 7 13/28.

2) = 8 7/14 - 3 10/14 =

7 21/14 - 3 10/14 = 4 11/14

3) = 24/7 * 10/9 = 8/7 * 10/3 = 80/21 = 3 17/21.

4) 5/8 * 4/7 = 5/2 * 1/7 = 5/14

5) 25/31 * 4 = 100/31 =

3 7/31

6) = 17/46 * 4/17 = 4/46 = 2/23

7) = 24 * 5/4 = 6*5 / 1 = 30/1 = 30

8) = 13/6 * 3/7 = 13/2 * 1/7 = 13/14