Hỏi đáp về Ôn tập cuối năm - Hình học 12

A. \(\left\{ \begin{array}{l}x = 1 + 2t\\y =  - 2 - t\\z = 3 + t\end{array} \right.\,\,\,\left( {t \in R} \right)\)   

B. \(\left\{ \begin{array}{l}x = 2 + t\\y =  - 1 + 2t\\z = 1 + 3t\end{array} \right.\,\,\,\left( {t \in R} \right)\)

C. \(\left\{ \begin{array}{l}x = 2 + t\\y =  - 1 - 2t\\z = 1 + 3t\end{array} \right.\,\,\,\left( {t \in R} \right)\) 

D. \(\left\{ \begin{array}{l}x = 1 - 2t\\y =  - 2 + t\\z = 3 - t\end{array} \right.\,\,\,\left( {t \in R} \right)\)

A. \(3 + 2i\)

B. \(2 + 3i\)

C. \(2 - 3i\)

D. \(3 - 2i\)

A. \(\left( {4;1; - 1} \right)\)

 B. \(\left( {2;\dfrac{1}{2}; - \dfrac{1}{2}} \right)\)

C. \(\left( {2; - 1;3} \right)\)

D. \(\left( { - 2;1; - 3} \right)\)

A. \(\dfrac{{21}}{{24}}V\)    

B. \(\dfrac{5}{6}V\)            

C. \(\dfrac{7}{8}V\)            

D. \(\dfrac{{11}}{{12}}V\)

A. \(4,5cm.\)                      

B. \(3cm.\)                        

C.\(6cm.\)                          

D. \(4cm.\)

A. Không tồn tại giá trị của m.                                    

B. \(m = \dfrac{3}{4}\).  

C.\(m = {\rm{ }}0.\)                                                       

D. \(m = {\rm{ }}9.\)

A.\(\dfrac{{9\pi {R^3}}}{8}\)     

B. \(\dfrac{{27\pi {R^3}}}{8}\).                                      

C. \(\dfrac{{9\pi {R^3}}}{2}\).   

D. \(36\pi {R^3}\)

A. Mặt cầu bán kính AB.                                             

B. Hình tròn bán kính AB.

C. Mặt cầu đường kính AB.                                         

D. Hình tròn đường kính AB.

A. \(\dfrac{{\sqrt {13} {a^3}}}{{12}}\) .                                

B. \(\dfrac{{\sqrt {11} {a^3}}}{{48}}\)          

C. \(\dfrac{{\sqrt {11} {a^3}}}{8}\).                       

D. \(\dfrac{{\sqrt {11} {a^3}}}{{24}}\)

A. \(5.\)                                   

B.\(2.\)                              

C.\(4.\)                              

D. \(3.\)

A. \(\sqrt 3 {a^3}\)            

B. \(\dfrac{{\sqrt 3 {a^3}}}{6}\)             

C. \(\dfrac{{\sqrt 3 {a^3}}}{3}\)      

D. \(\dfrac{{\sqrt 3 {a^3}}}{9}\) 

A. \(Sa.\)                            

B. \(\dfrac{1}{3}Sa.\).         

C. \(\dfrac{1}{4}Sa.\)          

D. \(\dfrac{1}{2}Sa.\)

A. \(16\pi {a^2}.\)                 B. \(2\pi {a^2}.\)               C. \(8\pi {a^2}.\)              D. \(4\pi {a^2}.\)

A. \(V = 10.\)               B. \(V = 5.\)                 C. \(V = 30.\)               D. \(V = 15.\)

A. \(V = \dfrac{{{a^3}\sqrt 3 }}{{12}}.\)

B. \(V = \dfrac{{{a^3}\sqrt 3 }}{8}.\)

C. \(V = \dfrac{{{a^3}}}{8}.\)

D. \(V = \dfrac{{{a^3}\sqrt 3 }}{{24}}.\)

A.\(V = 12\pi .\)                  

B.\(V = \dfrac{{16\pi \sqrt 3 }}{3}.\)                               

C.\(V = 16\sqrt 3 \pi .\)     

D. \(V = 4\pi .\)

A. \({S_{xq}} = 2\pi {a^2}.\)                 

B. \({S_{xq}} = \pi {a^2}.\)       

C. \({S_{xq}} = \pi \sqrt 2 {a^2}.\)                                             

D. \({S_{xq}} = \sqrt 2 {\pi ^2}a.\)

A.\(V = \dfrac{{{a^3}\sqrt 2 }}{6}.\)                                     

B. \(V = \dfrac{{{a^3}\sqrt 2 }}{3}.\)            

C. \(V = \dfrac{{{a^3}\sqrt 2 }}{4}.\)       

D. \(V = {a^3}\sqrt 2 .\)

A. \(\dfrac{{a\sqrt 6 }}{2}.\)                                         

B. \(\dfrac{{a\sqrt 3 }}{2}.\)           

C. \(\dfrac{{a\sqrt 6 }}{4}.\)      

D. \(\dfrac{{a\sqrt 2 }}{2}.\)

    A. \(\left( {2 + 2\sqrt 2 } \right)\pi {a^2}.\)

    B. \(\left( {4 + \sqrt 2 } \right)\pi {a^2}.\)

    C. \(\left( {2 + \sqrt 2 } \right)\pi {a^2}.\)

    D. \(\left( {1 + \sqrt 2 } \right)\pi {a^2}.\)

A. \({30^0}.\)                        B. \({60^0}.\)

C. \({90^0}.\)                        D. \({120^0}.\)

A. \(\dfrac{{{a^2}h\sqrt 3 }}{3}.\)                B. \(\dfrac{{{a^2}h\sqrt 3 }}{6}.\)

C. \(\dfrac{{{a^2}h\sqrt 3 }}{{12}}.\)           D. \(\dfrac{{{a^2}h\sqrt 3 }}{4}.\)

A. \(\dfrac{{4\pi {a^3}}}{3}.\)                           B. \(\dfrac{{\pi {a^3}}}{3}.\)

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

A. \(2250\pi \left( {c{m^3}} \right).\)           B. \(750\pi \left( {c{m^3}} \right).\)

C. \(2250\left( {c{m^3}} \right).\)           D. \(750\left( {c{m^3}} \right).\)