\(a,ƯC\left(6,9\right)=\left\{\pm1;\pm3\right\}\)
\(b,ƯC\left(7,8\right)=\left\{\pm1\right\}\)
\(c,ƯC\left(4;6;8\right)=\left\{\pm1;\pm2\right\}\)
ƯC (6,9) = {1;3}
ƯC (7,8) = {1}
ƯC (4,6,8) = {2}
a) ƯC ( 6,9 ) = { 1,3 }
b) ƯC ( 7,8 ) = { 1 }
c) ƯC ( 4,6,8 ) = { 1,2 }