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
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