Question

ƯCLN(30,70,20)

Answer 1

Ta có:

`30 = 2 . 3 . 5`

`70 = 2 . 5 . 7`

`20 = 2^2 . 5`

Suy ra: ` ƯC LN(30,70,20) = 2 . 5 =10`

Answer 2

Ta có: 

`30 = 2.3.5`

`70 = 2.5.7`

`20 = 2^2 . 5`

`=> UCLN(20;30;70) = 2.5 = 10`

Answer 3

Ta có :

`30 = 3.2.5`

`70 = 5.7.2`

`20 = 2^2 . 5`

`\Rightarrow` `Ư CLN``(30,70,20)``= 2 . 5 =10`