Cho \({\rm{A = \{ }}x \in \mathbb{N},\,(2x - {x^2})(2{x^2} - 3x - 2) = 0\} \) và \({\rm{B = \{ n}} \in \mathbb{N},\,3 < {n^2} < 30\} \). Tìm kết quả phép toán \[{\rm{A}} \cap {\rm{B}}\].

A. 31;

B. 54;

C. 39;

D. 47.

A. 15;

B. 16;

C. 18;

D. 22.

A. \[\left[ \begin{array}{l}{\rm{a}} < \frac{5}{2}\\{\rm{a}} \ge - \frac{1}{3}\end{array} \right.\];

B. \(\left[ \begin{array}{l}{\rm{a}} \ge \frac{5}{2}\\{\rm{a}} < - \frac{1}{3}\end{array} \right.\);

C. \( - \frac{1}{3} \le {\rm{a}} < \frac{5}{2}\);

D. \[ - \frac{1}{3} \le {\rm{a}} \le \frac{5}{2}\].

A. X = \(\emptyset \);

B. X = {0};

C. X = 0;

D. X = {\(\emptyset \)}.

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