Tìm ƯC(60,90,135)
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a)16=24
24=23.3
=>UCLN(16,24)=23=8
b)180=22.32.5
234=2.32.13
=>UCLN(180,234)=2.32=18
c)60=22.3.5
90=2.32.5
135=33.5
=>UCLN(60,90,135)=3.5=15
a) ƯCLN (16, 24) = 8, ƯC (16, 24) = {1; 2; 4; 8};
b) Ta có 180 = 22 . 32 . 5; 234 = 2 . 32 . 13;
ƯCLN (180, 234) = 2 . 32 = 18, ƯC (180, 234) = {1; 2; 3; 6; 9; 18};
c) Ta có 60 = 22 . 3 . 5; 90 = 2 . 32 . 5; 135 = 33 . 5. Do đó
ƯCLN (60, 90, 135) = 3 . 5 = 15; ƯC (60, 90, 135) = {1; 3; 5; 15}.
![](https://rs.olm.vn/images/avt/0.png?1311)
a)16=24
24=23.3
=>UCLN(16,24)=23=8
b)180=22.32.5
234=2.32.13
=>UCLN(180,234)=2.32=18
c)60=22.3.5
90=2.32.5
135=33.5
=>UCLN(60,90,135)=3.5=15
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(ƯC\left(8,12\right)=\left\{\pm1;\pm2;\pm4\right\}\)
\(ƯC\left(12;15;30\right)=\left\{\pm1;\pm3\right\}\)
\(ƯC\left(60;72\right)=\left\{\pm1;\pm2;\pm3;\pm4;\pm6;\pm12\right\}\)
\(ƯC\left(24;42\right)=\left\{\pm1;\pm2;\pm3;\pm6\right\}\)
Ta có :
60 = 22.3.5
90 = 2.32.5
135=33.5
=> ƯCLN(60,90,135) = 3.5=15
=> ƯC(60,90,135)=Ư(15)={1;3;5;15}