Ta có : 648 = 23.34
540 = 22.33.5
=> ƯCLN(648; 540) = 22.33 = 108
=> ƯC(648; 540) = Ư(108) = {\(\pm1;\pm2;\pm3;\pm4;\pm6;\pm9;\pm12;\pm18;\pm27;\pm36;\pm54;\pm108\)}
@Hoàng Việt
Ta có: \(648=2^3.3^4\)
\(540=2^2.3^3.5\)
\(\Rightarrow\) \(ƯCLN\) (648;540) = \(2^2.3^3=4.27=108\)
\(\RightarrowƯC\left(648;540\right)\inƯ\left(108\right)\)
\(\RightarrowƯC\left(648;108\right)\in\left\{\pm1;\pm2;\pm3;\pm4;\pm6;\pm9;\pm12;\pm18;\pm24;\pm36;\pm108\right\}\)Chúc bn hk tốt!