Ответ:НОК(6, 4) = 12: 5/6 = 10/12, 3/4 = 9/12.НОК(8, 6) = 24: 7/8 = 21/24, 5/6 = 20/24.НОК(28, 14) = 28: 5/28 = 5/28, 9/14 = 18/28.