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

A.\(9\)
B.\(1\)
C.\(20\)
D.\(6\)

A.\(2\)
B.\(3\)
C.\(4\)
D.\(5\)

A.\(3x - 2y - z - 7 = 0\)
B.\(x - y + 2z = 0\)
C.\(2x + z = 0\)
D.\(x - 2y + 2z + 2 = 0\)

A.\(\left\{ \begin{array}{l}x =  - 2 + 3t\\y = 1\\z = 1 + 2t\end{array} \right.\)
B.\(\left\{ \begin{array}{l}x = 4 - 3t\\y = 2 + t\\z = 5 + 2t\end{array} \right.\)
C.\(\left\{ \begin{array}{l}x =  - 2 + 3t\\y = t\\z = 1 + 2t\end{array} \right.\)
D.\(\left\{ \begin{array}{l}x =  - 1 + 4t\\y = 2t\\z = 1 + 5t\end{array} \right.\)

A.\(10\)
B.\( - 3\)
C.\(13\)
D.\(3\)

A.\(4\)
B.\(6\)
C.\(3\)
D.\(5\)

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

A.\(x =  - 1,\,\,y =  - 3\)
B.\(x = 1,\,\,y =  - 3\)
C.\(x =  - 1,\,\,y =  - 1\)
D.\(x = 1,\,\,y =  - 1\)

A.\(\dfrac{1}{{22}}\)
B.\(\dfrac{5}{{12}}\)
C.\(\dfrac{2}{7}\)
D.\(\dfrac{7}{{44}}\)