A.\(\left\{ \begin{array}{l}x = 2 - 2t\\y =  - 1 + 7t\\z =  - 4t\end{array} \right.\)
B.\(\left\{ \begin{array}{l}x = 2 + 2t\\y = 1 + 7t\\z = 4t\end{array} \right.\)
C.\(\left\{ \begin{array}{l}x = 2 + 2t\\y =  - 1 + 7t\\z = 4t\end{array} \right.\)
D.\(\left\{ \begin{array}{l}x = 2 + 2t\\y = 1 - 7t\\z = 4t\end{array} \right.\)

A.\(\dfrac{{3{a^3}}}{8}\)
B.\(\dfrac{{{a^3}}}{8}\)
C.\(\dfrac{{\sqrt 3 {a^3}}}{{24}}\)
D.\(\dfrac{{{a^3}}}{4}\)

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

A.\({30^0}\)
B.\({45^0}\)
C.\({60^0}\)
D.\({90^0}\)

A.\(\left[ {3; + \infty } \right)\)
B.\(\left[ { - 1;1} \right]\)
C.\(\left[ { - 3;3} \right]\)
D.\(\left( { - \infty ;1} \right]\)

A.\(\sqrt 6 \)
B.\(\dfrac{{\sqrt 6 }}{2}\)
C.\(\dfrac{1}{{\sqrt 6 }}\)
D.\(\sqrt 2 \)

A.\( - 3\)
B.\(1\)
C.\(3\)
D.\(0\)

A.\(I\left( { - 1;2; - 3} \right),\,\,R = 16\)
B.\(I\left( { - 1;2; - 3} \right),\,\,R = 4\)
C.\(I\left( {1; - 2;3} \right),\,\,R = 4\)
D.\(I\left( {1; - 2;3} \right),\,\,R = 16\)

A.\(C_7^3\)
B.\(6\)
C.\(A_7^3\)
D.\(36\)

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