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a) 72 và 60. ===> Lưu ý: VD: 2^2 = 2 mũ 2
72 = 3^2.2^3
60 = 5.3.2^2
ƯCLN (72,60) = 3.2^2 = 12
ƯC = Ư(12) = {1,2,3,4,6,12}
b) 90; 180 và 315
90 = 5.3^2.2
180 = 5.3^2.2^2
315 = 5.3^2.7
ƯCLN (90,180,315) = 5.3^2 = 125
ƯC = Ư(125) = { 1,125 }
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\(a,ƯCLN\left(540,168\right)=12\\ \RightarrowƯC\left(540,168\right)=Ư\left(12\right)=\left\{-12;-6;-4;-3;-2;-1;1;2;3;4;6;12\right\}\\ b,ƯCLN\left(735,350\right)=35\\ \RightarrowƯC\left(735,350\right)=Ư\left(35\right)=\left\{-35;-7;-5;-1;1;5;7;35\right\}\)
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Bài 1:
a: UCLN(180;234)=18
UC(180;234)={1;2;3;6;9;18}
b: UCLN(60;80;176)=4
UC(60;80;176)={1;2;4}
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a: UCLN(16;42)=2
UC(16;42)={1;2}
b: UCLN(16;42;86)=2
UC(16;42;86)={1;2}
c: UCLN(25;75)=25
UC(25;75)={1;5;25}
d: UCLN(25;55;75)=5
UC(25;55;75)={1;5}
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a: UCLN(16;42)=2
UC(16;42)={1;2}
b: UCLN(16;42;86)=2
UC(16;42;86)={1;2}
c: UCLN(25;75)=25
UC(25;75)={1;5;25}
d: UCLN(25;55;75)=5
UC(25;55;75)={1;5}
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300 = 3. 10. 10 = 3 . 22. 52
375 = 3 . 53
UCLN ( 300 ; 375 ) = 3 . 52 = 75
=> UC ( 300 ; 375 ) = Ư ( 75 ) = { 1; 75; 3; 25; 5; 15}
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