A.\(\left( { - \infty ;6} \right]\)
B.\(\left( { - \infty ;6} \right)\)
C.\(\left( { - 2; + \infty } \right)\)
D.\(\left[ { - 2; + \infty } \right)\)

A.\({x_0} =  - 4\)
B.\({x_0} = 3\)
C.\({x_0} =  - 3\)
D.\({x_0} =  - 1\)

A.\(\dfrac{{x - 1}}{4} = \dfrac{{y + 2}}{{ - 1}} = \dfrac{{z - 3}}{4}\) 
B.\(\dfrac{{x - 1}}{{ - 2}} = \dfrac{{y + 2}}{{ - 3}} = \dfrac{{z - 3}}{2}\)
C.\(2\left( {x - 1} \right) + 3\left( {y + 2} \right) - 2(z - 3 = 0\)
D.\(\dfrac{{x - 2}}{1} = \dfrac{{y - 3}}{{ - 2}} = \dfrac{{z + 2}}{3}\)

A.\(I\left( { - 1;2; - 3} \right)\) và \(R = 5\) 
B.\(I\left( {1; - 2;3} \right)\) và \(R = \sqrt 5 \)
C.\(I\left( {1; - 2;3} \right)\) và \(R = 5\) 
D.\(I\left( { - 1;2; - 3} \right)\) và \(R = 5\)

A.\(x = 0\)
B.\(z = 0\)
C.\(y = 0\)
D.\(x + z = 0\)

A.\(\vec u = \left( {2;3;1} \right)\)
B.\(\vec u = \left( {2;3;0} \right)\)
C.\(\vec u = \left( {1;2;3} \right)\)
D.\(\vec u = \left( {1; - 2;3} \right)\)

A.\(\dfrac{1}{2}\)
B.\(\dfrac{1}{6}\)
C.\(\dfrac{1}{4}\)
D.\(\dfrac{1}{3}\)

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

A.\(\dfrac{3}{4}\)
B.\( - 5\)
C.\( - \dfrac{7}{2}\)
D.\( - 3\)

A.\(\left( { - \infty ; - \dfrac{2}{3}} \right]\)
B.\(\left( { - \infty ;\dfrac{2}{5}} \right]\)
C.\(\left( {\dfrac{2}{5}; + \infty } \right]\)
D.\(\left[ { - \dfrac{2}{3}; + \infty } \right)\)