Bài này dễ mà
a ) 48 và 72
48 = 24.3
72 = 23.32
ƯCLN ( 48,72 ) = 23.3 = 12
b ) 132 và 156
132 = 22.3.11
156 = 22.3.13
ƯCLN = 22.3 = 12
a, 48 = 2\(^4\) . 3
72 = 2\(^3\) . 3\(^2\)
ƯCLN(48;72) = 2\(^3\).3= 24
ƯC(48;72)=Ư(24)\(\in\)\(\left\{1;2;3;4;6;8;12;24\right\}\)
=> ƯC(48;72)\(\in\)\(\left\{1;2;3;4;6;8;12;24\right\}\)
b,132=2\(^2\).3.11
156=2\(^2\).3.13
ƯCLN(132;156)=2\(^2\).3=12
ƯC(132;156)=Ư(12)\(\in\)\(\left\{1;2;3;4;6;12\right\}\)
=>ƯC132;156)\(\in\)\(\left\{1;2;3;4;6;12\right\}\)