... : íc chung 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} TiÕt 32 ξ17 íc chung lín ... nguyªn tè: 36; 84; 168 • C©u 1: • ThÕ nµo lµ íc chung cña hai hay nhiÒu sè? T×m ¦C(12,30) ¦(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 ... ¦CLN( 36, 84, 168 ) 36= 2 2 .3 3 84=2 2 .3.7 168 =2 3 .3.7 cln( 36, 84, 168 )=2 2 .3 =12 Quy t¾c: SGK TiÕt 32 §17 íc chung lín nhÊt ?1 T×m: • ¦CLN(12,30); ?2 T×m: • ¦CLN(8,9); • ¦CLN(8,12,15); • ¦CLN(24, 16, 8);...