A.\(V = \dfrac{1}{6}{a^3}\)
B.\(V = \dfrac{1}{3}{a^3}\)
C.\(V = {a^3}\)
D.\(V = \dfrac{1}{2}{a^3}\)

A.\(V = 1\)
B.\(V = \pi \)
C.\(V = 3\pi \)
D.\(V = \dfrac{1}{3}\pi \)

A.\(D = \left( {2; + \infty } \right)\)
B.\(D = \left( {\dfrac{5}{3}; + \infty } \right)\)
C.\(D = \left[ {\dfrac{5}{3}; + \infty } \right)\)
D.\(D = \mathbb{R}\backslash \left\{ {\dfrac{5}{3}} \right\}\)

A.\(\overrightarrow {AB}  = \left( {3;3; - 4} \right)\)
B.\(\overrightarrow {AB}  = \left( {2; - 1;3} \right)\)
C.\(\overrightarrow {AB}  = \left( {7;1;2} \right)\)
D.\(\overrightarrow {AB}  = \left( { - 3; - 3;4} \right)\)

A.\(\left\{ \begin{array}{l}x = 1 + 2t\\y = 2t\\z =  - 3t\end{array} \right.\)
B.\(\left\{ \begin{array}{l}x = 1 + 2t\\y =  - 2 + 2t\\z = 3 + 3t\end{array} \right.\)
C.\(\left\{ \begin{array}{l}x = 1 + 2t\\y =  - 2 + 2t\\z = 3 - 3t\end{array} \right.\)
D.\(\left\{ \begin{array}{l}x = 1 - 2t\\y = 2 + 2t\\z = 3 + 3t\end{array} \right.\)

A.\(2\)
B.\(3\)
C.\(1\)
D.\(12\)

A.\(14\) năm  
B.\(12\) năm  
C.\(11\) năm  
D.\(13\)năm

A.\(I\left( { - 1;3;0} \right),R = 3\)
B.\(I\left( {1; - 3;0} \right),R = 9\)
C.\(I\left( {1; - 3;0} \right),R = 3\)
D.\(I\left( { - 1;3;0} \right),R = 9\)

A.\(\left( { - 1;1;2} \right)\)
B.\(\left( { - 1;1; - 2} \right)\)
C.\(\left( { - 1; - 1;2} \right)\)
D.\(\left( {1;1;2} \right)\)

A.\(42\pi \)
B.\(12\pi \)
C.\(24\pi \)
D.\(36\pi \)