Пошаговое объяснение:

1) 5/9 : 3/4 = 5/9 * 4/3 = 20/27

2) 5 : 1/15 = 5 * 15/1 = 75/1 = 75

3) 1/6 : 2/5 = 1/6 * 5/2 = 5/12

4) 4 2/3 : 3 8/9 = 14/3 : 35/9 = 14/3 * 9/35 = 2/1 * 3/5 = 6/5 = 1 1/5

5) 7 1/9 : 11 1/4 = 64/9 : 45/4 = 64/9 * 4/45 = 256/405

6) 3 3/5 : 24/25 = 18/5 * 25/24 = 3/1 * 5/4 = 15/4 = 3 3/4