A. \(ƯC\left( {12;42;21} \right) = \left\{ {1;2;3;6} \right\}\)
B. \(ƯC\left( {12;42;21} \right) = \left\{ {1;2;4} \right\}\)
C. \(ƯC\left( {12;42;21} \right) = \left\{ {1;7} \right\}\)
D. \(ƯC\left( {12;42;21} \right) = \left\{ {1;3;5;15} \right\}\)
A. \(ƯC\left( {9;21} \right)=\{1;3;9\}\)
B. \(ƯC\left( {9;21} \right)=\{1;3\}\)
C. \(ƯC\left( {9;21} \right)=\{1;3;9;18\}\)
D. \(ƯC\left( {9;21} \right)=\{1;2;3\}\)
A. 10
B. 3
C. 5
D. 20
A. \(ƯCLN\left( {a,b} \right) = {2^3}.5\)
B. ƯCLN(a,b)=2.11
C. ƯCLN(a,b)=2.5
D. \(ƯCLN\left( {a,b} \right) = {2^3}{.3^2}{.5^2}.11\)
A. ƯCLN =(24;84)= ƯCLN(18;90)
B. ƯCLN(24;84)> ƯCLN(18;90)
C. ƯCLN(24;84)=2 ƯCLN(18;90)
D. ƯCLN(24;84)< ƯCLN(18;90)
A. 5
B. 7
C. 6
D. 8
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