9/16:2/3
13/46:19/23
5/71:20/27
8/13:13/19 ​

9/16 : 2/3 = 9/16 * 3/2 = 27/32

13/46 : 19/23 = 13/46 * 23/19 = 13/2 * 1/19 = 13/38

5/71 : 20/27 = 5/71 * 27/20 = 1/71 * 27/4 = 27/284

8/13 : 13/19 = 8/13 * 19/13 = 152/169

Пошаговое объяснение: