НОК 27,42.
НОК 15,70
НОК 25 105

27 = 3³

42 = 2 * 3 * 7

НОК(27, 42) = 2 * 3³ * 7 = 378

15 = 3 * 5

70 = 2 * 5 * 7

НОК(15, 70) = 2 * 3 * 5 * 7 = 210

25 = 5²

105 = 3 * 5 * 7

НОК(25, 105) = 3 * 5² * 7 = 525