83. ƯC ( 48, 120, 150 ) = ƯC ( 2 .3, 2 .3.5, 2.3.5 4 3 3 ) = ƯC...

1.83. ƯC ( 48, 120, 150 ) = ƯC ( 2 .3, 2 .3.5, 2.3.5 4 3 3 ) = ƯC ( ) { 6 = 1; 2; 3; 6 . }

BC ( 26, 78 ) = BC ( 2.13, 2.3.13 ) = B 78 ( ) { = 0; 78; 156;... } = { 78 k k ∈  } .