A.\(\left( {1; + \infty } \right)\)
B.\(\left[ {1; + \infty } \right)\)
C.\(\left( {0; + \infty } \right)\)
D.\(\mathbb{R}\)

A.\(P = {x^{\dfrac{{20}}{{21}}}}\)  
B.\(P = {x^{\dfrac{7}{4}}}\)  
C.\(P = {x^{\dfrac{{20}}{7}}}\)  
D.\(P = {x^{\dfrac{{12}}{5}}}\)

A.\(V = \sqrt 2 \pi \)  
B.\(V = 2\pi \)  
C.\(V = \dfrac{{\sqrt 2 \pi }}{3}\)  
D.\(V = \dfrac{{2\pi }}{3}\)

A.\(S = \left| {\int\limits_0^3 {\left( {{x^2} - 3x + 2} \right)dx} } \right|\)  
B.\(S = \int\limits_1^3 {\left| {{x^2} - 3x + 2} \right|dx} \)  
C.\(S = \int\limits_0^3 {\left| {{x^2} - 3x + 2} \right|dx} \)  
D.\(S = \int\limits_1^2 {\left| {{x^2} + x - 2} \right|dx} \)

A.\(12.600.000d\)
B.\(21.000.000d\)
C.\(20.900.000d\)
D.\(21.900.000d\)

A.\({S_{SBC}} = \dfrac{{\sqrt 2 {a^2}}}{2}\)
B.\({S_{SBC}} = \dfrac{{\sqrt 2 {a^2}}}{3}\)
C.\({S_{SBC}} = \dfrac{{{a^2}}}{3}\)
D.\({S_{SBC}} = \dfrac{{\sqrt 3 {a^2}}}{3}\)

A.\(m = 1\)
B.\(m =  - 1\)
C.\(m = 1\) hoặc \(m = 2\)
D.\(m = 2\)

A.\(1\)
B.\(4\)
C.\(3\)
D.\(2\)

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

A.\( - 1 < m \le 1\)
B.\(\left[ {\begin{array}{*{20}{c}}{m > 1}\\{m <  - 1}\end{array}} \right.\)
C.\(\left[ {\begin{array}{*{20}{c}}{m = 1}\\{m = 3}\end{array}} \right.\)
D.\(m \ge 1\)