9/14
Пошаговое объяснение:
1) 8/4 * 3/6 = 2 * 3/6 = 6/6 = 1
2) 5/7 * 3/6 = 15/42
3) 1 - 15/42 = 42/42 - 15/42 = 27/42 = 9/14
