@ @¶ìÿa@óÝy‹¾a@ u@ @T 2 144 2 72 2 36 2 18 39 33 1 .144 = 2 ×2 ×2 ×2 × 3 × 3 = 24 × 32 (.) [Greatest Common Divisor and Least Common Multiple] GCD GCD . : : :GCD(24, 40) . 1, 2, 3, 4, 6, 8 ,12, 24 : 24 1,2, 4, 5, 8,10, 20, 40 : 40 1,2, 4, 8 :