A.\(S = \left( {2 + 2\sqrt 2 } \right)\pi {a^2}\)
B.\(S = \left( {4 + 2\sqrt 2 } \right)\pi {a^2}\)
C.\(S = \left( {2 + 4\sqrt 2 } \right)\pi {a^2}\)
D.\(S = \left( {4 + 4\sqrt 2 } \right)\pi {a^2}\)

A.\(T = 0\)
B.\(T = 10\)
C.\(T = 6\)
D.\(T =  - 3\)

A.\({V_{\max }} = \dfrac{{8\sqrt 3 {R^3}}}{9}\)
B.\({V_{\max }} = \dfrac{{16\sqrt 3 {R^3}}}{{27}}\)
C.\({V_{\max }} = \dfrac{{8\sqrt 3 {R^3}}}{{27}}\)
D.\({V_{\max }} = \dfrac{{3\sqrt 3 {R^3}}}{8}\)

A.\(4x + 3y + 5z - 8 = 0\)                
B.\(2x + 3y + z - 4 = 0\)
C.\(4x + 5y + 3z - 8 = 0\)               
D.\(3x - 2y + 8z - 6 = 0\)

A.\(\dfrac{{13{a^3}}}{4}\)
B.\(\dfrac{{27{a^3}}}{8}\)
C.\(\dfrac{{25{a^3}}}{9}\)
D.\(\dfrac{{10{a^3}}}{3}\)

A.\(m = g\left( { - 3} \right)\)
B.\(m = g\left( { - 1} \right)\)
C.\(m = g\left( { - 4} \right)\)
D.\(m = g\left( 3 \right)\)

A.\(m \in \left( {0;4} \right)\)
B.\(m \in \left( {8;10} \right)\)
C.\(m \in \left( { - 4;0} \right)\)
D.\(m \in \left( {4;8} \right)\)

A.\(m \le 0\)
B.\(m \ge 0\)
C.\(m \ge  - 9\)
D.\(m \ge 9\)

A.\(I = \dfrac{\pi }{4}\)
B.\(I =  - \dfrac{\pi }{4}\)
C.\(I = \dfrac{1}{4}\)
D.\(I =  - \dfrac{1}{4}\)

A.Miền
B.Kết hợp.
C.Cột.
D.Đường.