Câu hỏi:

A. 15;

B. 16;

C. 18;

D. 22

A. {2; 5};

B. {2};

C. \[\emptyset \];

D. {0; 2; 3; 5; 7}

A. {5; 6};

B. {1; 2};

C. {2; 3; 4};

D. {0; 1; 5; 6}

A. 31;

B. 54;

C. 39;

D. 47

A. \(\left( {{\rm{A}} \cup {\rm{B}}} \right) \cap {\rm{C}} = \left( {{\rm{A}} \cap {\rm{B}}} \right) \cup {\rm{C}}\);

B. \({\rm{A}} \cup \left( {{\rm{B}} \cap {\rm{C}}} \right) = \left( {{\rm{A}} \cup {\rm{B}}} \right) \cap \left( {{\rm{A}} \cup {\rm{C}}} \right)\);

C. \[{\rm{A}} \cup {\rm{(B}} \cap {\rm{C)}}\,{\rm{ = }}\,({\rm{A}} \cup {\rm{B)}} \cap {\rm{C}}\];

D. \[{\rm{(A}} \cup {\rm{B)}} \cap {\rm{C}}\,{\rm{ = }}\,{\rm{(A}} \cup {\rm{B)}} \cap {\rm{(A}} \cup {\rm{C)}}\]

A. \(\left( {{\rm{A}}\backslash {\rm{B}}} \right) \cup \left( {{\rm{A}} \cap {\rm{C}}} \right) = \left\{ {{\rm{a}};{\rm{m}};{\rm{n}}} \right\}\);

B. \(\left( {{\rm{A}}\backslash {\rm{B}}} \right) \cup \left( {{\rm{A}} \cap {\rm{C}}} \right) = \left\{ {{\rm{a}};{\rm{c}};{\rm{m}};{\rm{n}}} \right\}\);

C. \(\left( {{\rm{A}}\backslash {\rm{B}}} \right) \cup \left( {{\rm{A}} \cap {\rm{C}}} \right) = \left\{ {{\rm{a}};{\rm{b}};{\rm{m}};{\rm{n}}} \right\}\);

D. \(\left( {{\rm{A}}\backslash {\rm{B}}} \right) \cup \left( {{\rm{A}} \cap {\rm{C}}} \right) = \left\{ {{\rm{a}};{\rm{n}}} \right\}\)

A. 0;

B. 1;

C. 0 và 1;

D. Không có

A. {2; 4};

C. {4; 5};

D. {3}

A. \[\left[ \begin{array}{l}{\rm{a}} \ge 3\\{\rm{a}} < 4\end{array} \right.\];

B. \[\left[ \begin{array}{l}{\rm{a}} > 3\\{\rm{a}} < - 4\end{array} \right.\];

C. \[\left[ \begin{array}{l}{\rm{a}} \ge 3\\{\rm{a}} \le - 4\end{array} \right.\];

D. \(\left[ \begin{array}{l}{\rm{a}} > 3\\{\rm{a}} \le - 4\end{array} \right.\)