a) Ta có: \(40=2^3.5\)
\(24=2^3.3\)
\(\rightarrowƯCLN\left(40,24\right)=2^3=8\)
\(\RightarrowƯC\left(40,24\right)=\left\{1;2;4;8\right\}\)
b) Ta có: \(12=2^2.3\)
\(52=2^2.13\)
\(\rightarrowƯCLN\left(12,52\right)=2^2=4\)
\(\RightarrowƯC\left(12,52\right)=\left\{1;2;4\right\}\)
c) Ta có: \(36=2^2.3^2\)
\(990=2.3^2.5.11\)
\(\rightarrowƯCLN\left(36,990\right)=2.3^2=18\)
\(\RightarrowƯC\left(36,990\right)=\left\{1;2;3;6;9;18\right\}\)
d) Ta có: \(54=2.3^3\)
\(36=2^2.3^2\)
\(\rightarrowƯCLN\left(54,36\right)=2.3^2=18\)
\(\RightarrowƯC\left(54,36\right)=\left\{1;2;3;6;9;18\right\}\)
e) Ta có: \(10=2.5\)
\(20=2^2.5\)
\(70=2.5.7\)
\(\rightarrowƯCLN\left(10,20,70\right)=2.5=10\)
\(\RightarrowƯC\left(10,20,70\right)=\left\{1;2;5;10\right\}\)
f) Ta có: \(25=5^2\)
\(55=5.11\)
\(75=3.5^2\)
\(\rightarrowƯCLN\left(25,55,75\right)=5\)
\(\RightarrowƯC\left(25,55,75\right)=\left\{1;5\right\}\)
