... 32 17 íc chung lín nhÊt¸p dông1: •¦CLN (12 ,15 ) = 3; •¦CLN(5 ,1) = 1; •¦CLN (12 ,30 ,1) = 1; Chó ý:• Sè 1 chØ cã mét íc lµ 1 •¦CLN(a ,1) = 1; •¦CLN(a,b ,1) = 1; •T×m ¦CLN( 36, 84, 16 8 )?TiÕt ... nguyªn tè: 36; 84; 16 8 ¦ (12 )={ 1, 2,3,4 ,6, 12 }(30)={ 1, 2,3,5 ,6, 10 ,15 ,30 }c (12 ,30)={ 1, 2,3,4 ,6 }@Trong c¸c íc chung cña 12 vµ 30 th× íc chung nµo lín nhÊt?TL c©u 1: TL c©u 2: 36= 22.3384=22.3.7 16 8 =23.3.7@ 36= 22.3384=22.3.7 16 8 =23.3.7Khi ... lín nhÊt 1. ¦íc chung lín nhÊt:VD: T×m ¦CLN (12 ,30)¦ (12 )={ 1, 2,3,4 ,6, 12 }(30)={ 1, 2,3,5 ,6, 10 ,15 ,30 }c (12 ,30)={ 1, 2,3 ,6 }cln (12 ,30) =6 ¦ (6) ={ 1, 2,3 ,6} ...