\(a,ƯCLN\left(98,238\right)=14\\ \RightarrowƯC\left(98,238\right)=Ư\left(14\right)=\left\{1;2;7;14\right\}\\ b,ƯCLN\left(175,1215,415\right)=5\\ \RightarrowƯC\left(175,1215,415\right)=Ư\left(5\right)=\left\{1;5\right\}\\ c,ƯCLN\left(32,154,1458\right)=2\\ \RightarrowƯC\left(32,154,1458\right)=Ư\left(2\right)=\left\{1;2\right\}\)