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A 22

B 8

C 9

D 10

A a) \({\rm{UC(6;\,20) = }}\left\{ {{\rm{1;\,2}}} \right\}\)

b) \(\left\{ {32;\,64} \right\} \subset {\rm{B(8)}} \\ \Rightarrow UC(8;\,32;\,64) = U(8) = \left\{ {{\rm{1;\,2;\,4;\,8}}} \right\}\)

B a) \({\rm{UC(6;\,20) = }}\left\{ {{\rm{1;\,4}}} \right\}\)

b) \(\left\{ {32;\,64} \right\} \subset {\rm{B(8)}} \\ \Rightarrow UC(8;\,32;\,64) = U(8) = \left\{ {{\rm{1;\,2;\,8}}} \right\}\)

C a) \({\rm{UC(6;\,20) = }}\left\{ {{\rm{0;\,2}}} \right\}\)

b) \(\left\{ {32;\,64} \right\} \subset {\rm{B(8)}} \\ \Rightarrow UC(8;\,32;\,64) = U(8) = \left\{ {{\rm{1;\,2;\,4}}} \right\}\)

D a) \({\rm{UC(6;\,20) = }}\left\{ {{\rm{1;\,4}}} \right\}\)

b) \(\left\{ {32;\,64} \right\} \subset {\rm{B(8)}} \\ \Rightarrow UC(8;\,32;\,64) = U(8) = \left\{ {{\rm{4;\,8}}} \right\}\)

A a) C= { văn} 

b) \(X \cap Y = Y\)

c) \(A \cap B = \emptyset \)

B a) C= {toán} 

b) \(X \cap Y = X\)

c) \(A \cap B = \emptyset \)

C a) C= {toán, văn} 

b) \(X \cap Y = X\)

c) \(A \cap B = \emptyset \)

D a) C= {toán, văn} 

b) \(X \cap Y = Y\)

c) \(A \cap B = \emptyset \)