1) HCK(9; 6) = 2 • 32 = 18; 2) НСК(20; 25) = 22 • 52 = 100.
НОК (6, 9) = 3 • 3 • 2 = 18
НОК (12, 25) = 5 • 5 • 2 • 2 • 3 = 300