A.\(\dfrac{{{a^3}\sqrt 6 }}{3}\)
B.\(\dfrac{{{a^3}\sqrt 6 }}{9}\)
C.\(\dfrac{{{a^3}\sqrt 2 }}{3}\)
D.\(\dfrac{{{a^3}\sqrt 6 }}{2}\) hoặc \(m > 1\)

A.\(\left[ {\dfrac{7}{3}; + \infty } \right)\)
B.\(\left[ { - 3;\dfrac{7}{3}} \right]\)
C.\(\left( { - \infty ;\dfrac{7}{3}} \right]\)
D.\(\left[ { - 3; + \infty } \right)\) hoặc \(m > 1\)

A.\( - 6\)
B.\( - 5\)
C.\( - 8\)
D.\( - 10\)

A.\(\dfrac{{\sqrt 7 }}{{24}}{a^3}\)
B.\(\dfrac{{\sqrt 7 }}{8}{a^3}\)
C.\(\dfrac{{\sqrt {14} }}{8}{a^3}\)
D.\(\dfrac{{\sqrt {14} }}{{24}}{a^3}\)

A.\(4\)
B.\(6\)
C.\(3\)
D.\(5\)

A.\(\dfrac{{2\sqrt 3  + \sqrt {51} }}{3}\)
B.\(\sqrt {2021}  + 2\)
C.\(\sqrt {2021} \)
D.\(\sqrt {2022} \)

A.CH3COOC2H5.
B.C6H5OH.
C.C6H5NH2.
D.CH3COOH.

A.CnH2n (n ≥ 3).
B.CnH2n-2 (n ≥ 2).
C.CnH2n+2 (n ≥ 1).
D.CnH2n (n ≥ 2).

A.Al3+, Cr3+.
B.Fe2+, Fe3+.
C.Ca2+, Mg2+.
D.Na+, K+.

A.saccarozơ.
B.glucozơ.
C.xenlulozơ.
D.tinh bột.