`a)` - Ta có :
`16=2^4`
`24=2^3 .3`
`=> Ư CLN(16,24)=2^3=8`
- Vậy ` Ư CLN(16,24)=8`
- Ta lại có : ` ƯC(16,24) = Ư(8) = {1;2;4;8}`
`=> ƯC(16,24)={1;2;4;8}`
`b)` - Ta có :
`180=2^2 .3^2 .5`
`234=2.3^2 .13`
`=> Ư CLN(180,234)=2.3^2=2.9=18`
- Vậy ` Ư CLN(180,234)=18`
- Ta lại có : ` ƯC(180,234)=Ư(18)={1;2;3;6;9;18}`
`=> ƯC(180,234)={1;2;3;6;9;18}`
`c)` - Ta có :
`60=2^2 .3.5`
`90=2.3^2 .5`
`135=3^3 .5`
`=> Ư CLN(60,90,135)=3.5=15`
- Vậy ` Ư CLN(60,90,135)=15`
- Ta lại có : ` ƯC(60,90,135)=Ư(15)={1;3;5;15}`
`=> ƯC(60,90,135)={1;3;5;15}`
