A.\(\sqrt {\dfrac{{10}}{3}} \)
B.\(\sqrt 3 \)
C.\(\dfrac{{12}}{{\sqrt 6 }}\)
D.\(\sqrt {12} \)

A.\(\left( { - \infty ;0} \right)\)
B.\(\left( { - 1;1} \right)\)
C.\(\left( { - \infty ; - 1} \right]\)
D.\(\left( { - \infty ; - 1} \right)\)

A.\(\left( \alpha  \right)//Oy\)
B.\(\left( \alpha  \right)//Ox\)
C.\(\left( \alpha  \right)//\left( {Oyz} \right)\)
D.\(\left( \alpha  \right)\) chứa trục \(Ox\)

A.\(\dfrac{{\sqrt 3 }}{2}\)
B.\(\dfrac{{\sqrt 2 }}{2}\)
C.\(\sqrt {\dfrac{3}{{10}}} \)
D.\(\dfrac{{\sqrt 5 }}{5}\)

A.\(\pi {a^3}\)
B.\(2\pi {a^3}\)
C.\(\dfrac{{2\pi {a^3}}}{3}\)
D.\(\dfrac{{\pi {a^3}}}{3}\)

A.\( - \dfrac{{35}}{{16}}\)
B.\( - \dfrac{{35}}{{16}}{x^5}\)
C.\( - \dfrac{{35}}{2}{x^5}\)
D.\(\dfrac{{35}}{{16}}\)

A.\(y = 1\)
B.\(y =  - 4x - 2\)
C.\(y = 4x + 23\)
D.\(y =  - 4x + 2\)

A.\(\dfrac{x}{2} = \dfrac{y}{1} = \dfrac{{z - 1}}{1}\)
B.\(\dfrac{x}{1} = \dfrac{y}{{ - 2}} = \dfrac{{z - 1}}{1}\)
C.\(\dfrac{x}{{ - 2}} = \dfrac{y}{{ - 1}} = \dfrac{{z - 1}}{{ - 1}}\)
D.\(\dfrac{x}{2} = \dfrac{y}{{ - 5}} = \dfrac{{z - 1}}{1}\)

A.\(m <  - 4\)
B.\(m >  - 4\)
C.\(m \le  - 4\)
D.\(m \ge  - 4\)

A.\(\min b \in \left[ {1;2} \right]\)
B.\(\max a = \min b\)
C.\(\min c \in \left( { - 1;1} \right)\)
D.\(\max c \in \left[ {\sqrt 2 ;2} \right]\)