... = 43.10 + 43 = 430 + 43 = 4373 67 101= 67 67 423 1001 = 423 423 d/ 67 99 = 67 .(100 1) = 67 .100 67 = 67 00 67 = 66 33 998 34 = 34 (100 2) = 34.100 34.2 = 3400 68 = 33 932 Bỏi 4: Tớnh nhanh cỏc ... 3: Chng t rng: a/ 61 00 chia ht cho b/ 2120 1110 chia ht cho v Hng dn a/ 61 00 cú ch s hng n v l (VD 61 = 6, 62 = 36, 63 = 2 16, 64 = 12 96, ) suy 61 00 cú chu s hng n v l Vy 61 00 chia ht cho b/ ... (6) , (12), (42) v C (6, 12, 42) b/ B (6) , B(12), B(42) v BC (6, 12, 42) S: a/ (6) = { 1; 2;3 ;6} (12) = { 1; 2;3; 4 ;6; 12} (42) = { 1; 2;3 ;6; 7;14; 21; 42} C (6, 12, 42) = { 1; 2;3 ;6} b/ B (6) = { 0 ;6; 12;18;...