Ответ:

Пошаговое объяснение:

Б)

1) 1. 7/24 + 2. 7/30 = 1. 35/120 + 2. 28/120 = 3. 63/120 = 3. 21/40

2) 3. 21/40 * 30/47 = 141/40 * 30/47 = 3/4 * 3/1 = 9/4 = 2. 1/4

3) 2. 1/4 - 5/8 = 2. 2/8 - 5/8 = 1. 10/8 - 5/8 = 1. 5/8

В)

1) 3. 1/5 * 7/12 = 16/5 * 7/12 = 4/5 * 7/3 = 28/15 = 1. 13/15

2) 2. 7/30 - 1. 13/15 = 2. 7/30 - 1. 26/30 = 1. 37/30 - 1. 26/30 = 11/30

3) 11/30 * 7. 1/2 = 11/30 * 15/2 = 11/2 * 1/2 = 11/4 = 2. 3/4