A.\(4\)
B.\(2\)
C.\(1\)
D.\(3\)

A.\(\dfrac{{\sqrt {14} a}}{3}\)
B.\(\dfrac{{\sqrt {14} a}}{6}\)
C.\(\sqrt {14} a\)
D.\(\dfrac{{\sqrt {14} a}}{{12}}\)

A.\( - 26\)
B.\(26\)
C.\( - 34\)
D.\(34\)

A.\(4\,687\,000\) đồng.
B.\(4\,697\,000\) đồng.
C.\(4\,690\,000\) đồng
D.\(4\,700\,000\) đồng.

A.\(6 + \sqrt {37} \)
B.\(5 + \sqrt {23} \)
C.\(6 + \sqrt {11} \)
D.\(6 + \sqrt {13} \)

A.\(10\)
B.\(26\)
C.\(1\)
D.\(53\)

A.\(\left( {3;1; - 2} \right)\)
B.\(\left( {\dfrac{1}{2}; - \dfrac{3}{2};2} \right)\)
C.\(\left( { - \dfrac{1}{2};\dfrac{3}{2}; - 2} \right)\)
D.\(\left( {\dfrac{3}{2};\dfrac{1}{2}; - 1} \right)\)

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

A.\(6\pi \)
B.\(12\pi \)
C.\(15\pi \)
D.\(33\pi \)

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