@ @U@ @†a‡Èÿa@ @ GCD(24, 40) = 8 8 : 40 24 . 24 = 23 × 3 40 = 23 × 5 . 32 GCD(24, 40) = 23 = 8 . 120, 72, 24 GCD ( ) LCM : : LCM 24 = 23 × 3 72 = 23 × 32 : LCM(8,10) 120 = 23 × 3 × 5 .GCD(24, 72,120) = 23 × 3 = 24 . : 8,16,24, 32, 40, 48,… : 8