A.\(14\)
B.\(42\)
C.\(126\)
D.\(12\)

A.\(10\)
B.\(30\)
C.\(90\)
D.\(15\)

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

A.\(\left[ { - 1;1} \right]\)  
B.\(\left( { - \infty ;1} \right]\)  
C.\(\;\left[ { - \sqrt 7 ;\sqrt 7 } \right]\)
D.\(\left[ {1; + \infty } \right)\)

A.3  
B.2  
C.\(\dfrac{3}{4}\)   
D.\(\dfrac{3}{2}\)

A.50  
B.10   
C.\(\sqrt {10} \)
D.\(5\sqrt 2 \)

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

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

A.\(23.591.000\) đồng
B.\(36.173.000\) đồng
C.\(9.437.000\) đồng
D.\(4.718.000\) đồng

A.\(\dfrac{{{a^3}}}{8}\)
B.\(\dfrac{{3{a^3}}}{8}\)
C.\(\dfrac{{\sqrt 3 {a^3}}}{{12}}\)
D.\(\dfrac{{{a^3}}}{4}\)