A.\(55\pi \)
B.\(100\pi \)
C.\(75\pi \)
D.\(50\pi \)

A.\(47 - 12\sqrt 6 \)
B.\(\dfrac{{141}}{8}\)
C.\(39 - 12\sqrt 6 \)
D.\(\dfrac{{77}}{8}\)

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

A.\(8\)
B.\(32\)
C.\(6\)
D.\(4\)

A.\(48\pi \)
B.\(30\pi \)
C.\(15\pi \)
D.\(36\pi \)

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

A.\(7\)
B.\(4\)
C.\(3\)
D.\(2\)

A.\( - 5 + 6\sqrt 3 \)
B.\(\dfrac{{11}}{2}\)
C.\( - 4 + 6\sqrt 2 \)
D.\(\dfrac{{27}}{5}\)

A.Polietilen.
B.Poli(vinyl clorua).
C.Poli(metyl metacrylat).
D.Poliacrilonitrin.

A.CH3COONa và CH3COOH.
B.CH3COOH và CH3ONa.
C.CH3OH và CH3COOH.
D.CH3COONa và CH3OH.