Question

giúp mik với ạ

Answer 1

Ta có:

\(30=2.3.5\)          ;   \(45=3^2.5\)         ;    \(75=3.5^2\)

\(\RightarrowƯCLN\left(30;45;75\right)=3.5=15\)

\(\RightarrowƯC\left(30;45;75\right)=Ư\left(15\right)=\left\{1;3;5;15\right\}\)