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\(ƯC\left(8,12\right)=\left\{\pm1;\pm2;\pm4\right\}\)
\(ƯC\left(12;15;30\right)=\left\{\pm1;\pm3\right\}\)
\(ƯC\left(60;72\right)=\left\{\pm1;\pm2;\pm3;\pm4;\pm6;\pm12\right\}\)
\(ƯC\left(24;42\right)=\left\{\pm1;\pm2;\pm3;\pm6\right\}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) { 1; 2; 4 }
b) { 1; 3 }
c) { 1; 2; 3; 4; 6; 12 }
d) { 1; 2; 3; 6 }
![](https://rs.olm.vn/images/avt/0.png?1311)
Ý bn là tìm phần tử à:
a, ƯC(8;12)= ƯCLN (8;12)
Ta có: 8= 23 và 12 = 22.3
\(\Rightarrow\)ƯCLN(8;12)= 22= 4
\(\Rightarrow\)ƯC (8;12)= Ư(4)= {1;2;4}
b, ƯC (12;15;30)= ƯCLN (12;15;30)
Ta có: 12= 22.3
15= 3.5
30= 3.2.5
\(\Rightarrow\)ƯCLN (12;15;30)= 2.3= 6
\(\Rightarrow\)ƯC (12;15;30)= Ư(6)= {1;2;3;6}
c, ƯC (60;72)= ƯCLN (60;72)
Ta có: 60= 22.3.5 và 72= 23.32
\(\Rightarrow\)ƯCLN (60;72)= 22= 4
\(\Rightarrow\)ƯC(60;72)= Ư(4)= {1;2;4}
d, ƯC (24;42)= ƯCLN (24;42)
Ta có: 24= 23.3 và 42= 2.3.7
\(\Rightarrow\)ƯCLN (24;42)= 3
\(\Rightarrow\)ƯC (24;42)= Ư(3)= {1;3}
Chúc bn học tốt
![](https://rs.olm.vn/images/avt/0.png?1311)
a, Ta có : \(Ư\left(16\right)=1;2;4;8;16\) và \(Ư\left(24\right)=1;2;3;4;6;8;12;24\)
\(\RightarrowƯC\left(16;24\right)=1;2;4;8\)
b, Ta có : \(\hept{\begin{cases}Ư\left(60\right)=1;2;3;4;5;6;10;12;15;20;20;60\\Ư\left(90\right)=1;2;3;5;6;9;10;15;18;30;45;90\end{cases}}\)
\(\RightarrowƯC\left(60;90\right)=1;2;3;5;6;15;30\)
c, Ta có : \(\hept{\begin{cases}Ư\left(18\right)=1;2;3;6;9;18\\Ư\left(30\right)=1;2;3;5;6;10;15;30\\Ư\left(42\right)=1;2;3;6;7;14;21;42\end{cases}}\)\(\RightarrowƯC\left(18;30;42\right)=1;2;3;6\)
d,Ta có : \(\hept{\begin{cases}Ư\left(26\right)=1;2;13;26\\Ư\left(39\right)=1;3;13;39\\Ư\left(48\right)=1;2;4;6;8;12;16;24;48\end{cases}}\)\(\RightarrowƯC\left(26;39;48\right)=1\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(36=2^2\cdot3^2\\ 120=2^3\cdot3\cdot5\\ ƯCLN\left(36,120\right)=2^2\cdot3=12\\ ƯC\left(36,120\right)=Ư\left(12\right)=\left\{...\right\}\)
Ta có: 36= 2^2. 3^2
120= 2^3. 3.5
=> ƯCLN( 36; 120)- 2^2. 3= 12
=> ƯC(36;120) = Ư(12) = { 1; 2; 3; 4; 6; 12}
![](https://rs.olm.vn/images/avt/0.png?1311)
1) 12 = 2².3
24 = 2³.3
⇒ ƯCLN(12; 24) = 2².3 = 12
⇒ ƯC(12; 24) = Ư(12) = {1; 2; 3; 4; 6; 12}
2) 15 = 3.5
20 = 2².5
⇒ ƯCLN(15; 20) = 5
⇒ ƯC(15; 20) ={1; 5}
3) 25 = 5²
40 = 2³.5
⇒ ƯCLN(25; 50) = 5
⇒ ƯC(25; 40) = Ư(5) = {1; 5}
4) 30 = 2.3.5
45 = 3².5
⇒ ƯCLN(30; 45) = 3.5 = 15
⇒ ƯC(30; 45) = {1; 3; 5; 15}
Ư(45)={1,45,3,15,5,9}
Ư(60)={1,60,2,30,3,20,4,15,5,12,6,10}
Ư(9) ={1,9,3}
Ư(45,60,9)={1,3}