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

A.\(6\sqrt 3 \pi \)
B.\(4\pi \)
C.\(12\sqrt 3 \pi \)
D.\(8\pi \)

A.\(\dfrac{{6e + 13}}{6}\)
B.\(\dfrac{{6e + 25}}{6}\)
C.\(\dfrac{{6e + 25}}{3}\)
D.\(\dfrac{{6e + 19}}{6}\)

A.\(2\)
B.\(1\)
C.\(0\)
D.\(3\)

A.\(\dfrac{{2{a^3}}}{3}\)
B.\(\dfrac{{{a^3}}}{6}\)
C.\({a^3}\)
D.\(\dfrac{{{a^3}}}{3}\)

A.\(\sqrt 5 \)
B.\(\dfrac{{\sqrt {38} }}{4}\)
C.\(\sqrt {35} \)
D.\(\dfrac{{\sqrt {26} }}{2}\)

A.\(m \ge \dfrac{1}{3}\left[ {f\left( {\dfrac{\pi }{2}} \right) - 1} \right]\)
B.\(m \ge \dfrac{1}{3}f\left( {\dfrac{\pi }{4}} \right) - \dfrac{1}{6}\)
C.\(m \ge \dfrac{1}{3}f\left( 0 \right)\)
D.\(m > \dfrac{1}{3}\left[ {f\left( {\dfrac{\pi }{2}} \right) - 1} \right]\)

A.\(\dfrac{1}{{2\sqrt {14} }}\)
B.\(\dfrac{2}{{\sqrt {14} }}\)
C.\(\dfrac{1}{{\sqrt {14} }}\)
D.\(\dfrac{3}{{2\sqrt {14} }}\)

A.\(8\)
B.\(9\)
C.\(7\)
D.\(6\)

A.hồ tiêu, lạc
B.mía, thuốc lá.
C.cao su, điều.
D.cà phê, dừa