A.\(7\) và \(\sqrt 5 \)
B.\( - 7\) và \(\sqrt 5 \)
C.\(7\) và \(i\sqrt 5 \)
D.\(7\) và \( - \sqrt 5 \)

A.\(32\)
B.\(34\)
C.\(42\) 
D.\(46\)

A.\({\left( {x - 1} \right)^2} + {\left( {y + 2} \right)^2} + {\left( {z - 3} \right)^2} = 4\)
B.\({\left( {x + 1} \right)^2} + {\left( {y - 2} \right)^2} + {\left( {z + 3} \right)^2} = 4\)
C.\({\left( {x - 1} \right)^2} + {\left( {y + 2} \right)^2} + {\left( {z - 3} \right)^2} = 2\)
D.\({\left( {x + 1} \right)^2} + {\left( {y - 2} \right)^2} + {\left( {z + 3} \right)^2} = 2\)

A.\(\dfrac{x}{3} + \dfrac{y}{1} + \dfrac{z}{{ - 2}} = 1\)
B.\(\dfrac{x}{1} + \dfrac{y}{{ - 2}} + \dfrac{z}{3} = 0\)
C.\(\dfrac{x}{{ - 2}} + \dfrac{y}{1} + \dfrac{z}{3} = 1\)
D.\(\dfrac{x}{1} + \dfrac{y}{{ - 2}} + \dfrac{z}{3} = 1\)

A.\(\overrightarrow m  = \left( {1; - 4;2} \right)\)
B.\(\overrightarrow u  = \left( {1;2;2} \right)\)
C.\(\overrightarrow v  = \left( { - 3;4; - 2} \right)\) 
D.\(\overrightarrow n  = \left( {1;2;6} \right)\)

A.\({\left( {x - 1} \right)^2} + {\left( {y - 1} \right)^2} + {\left( {z - 1} \right)^2} = 4\)
B.\({\left( {x + 1} \right)^2} + {\left( {y + 1} \right)^2} + {\left( {z + 1} \right)^2} = 2\)
C.\({\left( {x + 1} \right)^2} + {\left( {y + 1} \right)^2} + {\left( {z + 1} \right)^2} = 4\)
D.\({\left( {x - 1} \right)^2} + {\left( {y - 1} \right)^2} + {\left( {z - 1} \right)^2} = 2\)

A.\(\dfrac{a}{2}\)
B.\(\dfrac{{a\sqrt 6 }}{3}\) 
C.\(\dfrac{{a\sqrt 3 }}{3}\)
D.\(\dfrac{{a\sqrt 2 }}{2}\)

A.\({45^0}\)
B.\({30^0}\)
C.\({120^0}\)
D.\({60^0}\)

A.\(12\)
B.\(1\)
C.\(11\)
D.\(12i\)

A.\(I = \dfrac{{1 - \sqrt 2 }}{{\sqrt 2 }}\)
B.\(I = 1 - \sqrt 2 \)
C.\(I = \dfrac{{\sqrt 2  - 1}}{{\sqrt 2 }}\)
D.\(I = \sqrt 2  - 1\)