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.\({90^0}\)

A.\( - \dfrac{5}{3}\)
B.1
C.\( - \dfrac{1}{3}\)
D.\( - 1\)

A.\({S_{xq}} = 2\pi {R^2}\)
B.\({S_{xq}} = 2\pi Rl\)
C.\({S_{xq}} = \pi Rl\)
D.\({S_{xq}} = \dfrac{4}{3}\pi {R^3}\)

A.\(\dfrac{{7!}}{{3!}}\)
B.\(A_7^3\)
C.21
D.\(C_7^3\)

A.9
B.4
C.36
D.\(\dfrac{1}{4}\)