а) 12 и 8
12 = 2²⋅3
8 = 2³
НОК(12, 8) = 2³⋅3 = 8⋅3 = 24
б) 14 и 42
14 = 2⋅7
42 = 2⋅3⋅7
НОК(14, 42) = 2⋅3⋅7 = 42
в) 108 и 132
108 = 2²⋅3³
132 = 2²⋅3⋅11
НОК(108, 132) = 2²⋅3³⋅11 = 4⋅27⋅11 = 1188
г) 90 и 315
90 = 2⋅3²⋅5
315 = 3²⋅5⋅7
НОК(90, 315) = 2⋅3²⋅5⋅7 = 2⋅9⋅5⋅7 = 630
д) 10, 15 и 30
10 = 2⋅5
15 = 3⋅5
30 = 2⋅3⋅5
НОК(10, 15, 30) = 2⋅3⋅5 = 30
е) 6, 8 и 12
6 = 2⋅3
8 = 2³
12 = 2²⋅3
НОК(6, 8, 12) = 2³⋅3 = 8⋅3 = 24
Ответ: a) 24; б) 42; в) 1188; г) 630; д) 30; е) 24