Ответ:

Пошаговое объяснение:

1.

1) 1. 5/7 * 4. 2/3 = 12/7 * 14/3 = 4/1 * 2/1 = 8/1 = 8

2) 8 * 1/2 = 8/2 = 4

3) 5/9 + 4 = 4. 5/9

2.

5/8 : 1. 3/4 = 5/8 : 7/4 = 5/8 * 4/7 = 5/2 * 1/7 = 5/14