A.1
B.7
C.\(\dfrac{7}{9}\)
D.\(\dfrac{1}{9}\)

A.\(16\pi {a^3}\)
B.18\(\pi {a^3}\)
C.8\(\pi {a^3}\)
D.4\(\pi {a^3}\)

A.\(x + 2y - 3z - 9 = 0\)
B.\(x + 2y - 3z + 9 = 0\)
C.\(x + 2y - 3z + 7 = 0\)
D.\(x + 2y - 3z - 7 = 0\)

A.\(\int\limits_{ - 1}^2 {\left( {2x - 2} \right)dx} \)
B.\(\int\limits_{ - 1}^2 {\left( { - 2x + 2} \right)dx} \)
C.\(\int\limits_{ - 1}^2 {\left( {2{x^2} - 2x - 4} \right)dx} \)
D.\(\int\limits_{ - 1}^2 {\left( { - 2{x^2} + 2x + 4} \right)dx} \)

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

A.\(f\left( x \right) = 3{x^2} + {e^x}\)
B.\(f\left( x \right) = \dfrac{{{x^4}}}{{12}} + {e^x}\)
C.\(f\left( x \right) = {x^2} + {e^x}\)
D.\(f\left( x \right) = \dfrac{{{x^2}}}{3} + {e^x}\)

A.4
B.3
C.2
D.5

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

A.vô số.
B.1
C.2
D.0

A.\({45^0}\)
B.\({60^0}\)
C.\({30^0}\)
D.\({90^0}\)