\(ƯCLN\left(15,50\right)=5\\ ƯC\left(15,50\right)=Ư\left(5\right)=\left\{...\right\}\\ ƯCLN\left(36,48\right)=12\\ ƯC\left(36,48\right)=Ư\left(12\right)=\left\{...\right\}\\ ƯCLN\left(20,65\right)=5\\ ƯC\left(20,65\right)=Ư\left(5\right)=\left\{...\right\}\)