Tìm ƯC (24,36), theo hai cách khác nhau
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+24=23.3
36=22.32
UCLN(24;36) =22.3=12
+ 36 = 24.1 + 12
24 = 12.2
=> UCLN(24;36) =12
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Cách 1 :
\(U\left(24\right)=\left\{1;2;3;4;6;8;12;24\right\}\)
\(U\left(36\right)=\left\{1;2;3;4;6;9;12;16;36\right\}\)
\(UC\left(24,36\right)=\left\{1;2;3;4;6;12\right\}\)
Cách 2 :
Ta có : \(24=2^3.3\)
\(36=2^2.3^2\)
\(\Rightarrow UCLN\left(24,36\right)=12\)
\(U\left(12\right)=\left\{1;2;3;4;6;12\right\}\)
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1.27=33
45=32.5
ƯCLN(27,45)=32=9
ƯC(27,45)={1,3,9}
3.C1:ƯC(24)={1,2,3,4,6,8,12,24}
ƯC(36)={1,2,3,4,6,9,12,18,36}
=>ƯC(24,36)={1,2,3,4,6,12}
C2:24=23.3
36=22.32
=>ƯCLN(24,36)=22.3=12
=>ƯC(24,36)={1,2,3,4,6,12}
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UC(24;36)=1,2,3,4,6,-1,-2,-3,-4,-6,12,-12
UC(12;15)=1,-1,2,-2,3,-3,
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