Задание 78

Выполняем деление дробей: 1) (5/6) ÷ (7/4) = (5/6) * (4/7) = 20/42 = 10/21. 2) (3/8) ÷ (15/32) = (3/8) * (32/15) = 96/120 = 4/5. 3) (45/56) ÷ (48/49) = (45/56) * (49/48) = 2205/2688 = 735/896. 4) (1/4) ÷ (5/3) = (1/4) * (3/5) = 3/20. Ответы: 10/21, 4/5, 735/896, 3/20.