Ответ:

7/18 * 1/6 = 7/1087/18 * 3/7 = 1/67/18 * 9/7 = 1/27/18 * 9 = 7/27/18 * 1/7 = 1/187/18 * 1/2 = 7/367/18 * 6/35 = 1/457/18 * 6 = 7/3