Ответ:

1/8

Пошаговое объяснение:

1) 0,6 + 7/20 = 6/10 + 7/20 = 12/20 + 7/20 = 19/20

2) 1 1/7 - 2/5 = 8/7 - 2/5 = 40/35 - 14/35 = 26/35

3) 19/20 : 26/35 = 19/20 * 35/26 = 19/4 * 7/26 = 133/104

4) 133/104 * 13/19 = 7/8 * 1/1 = 7/8

5) 7/8 - 0,75 = 7/8 - 75/100 = 7/8 - 3/4 = 7/8 - 6/8 = 1/8