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

A.\(5.\)
B.\(4.\)
C.\(3.\)
D.\(2.\)

A.\(202.\)
B.\(203.\)
C.\(206.\)
D.\(207.\)

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

A.\(216\,\pi {a^3}.\)
B.\(150\pi {a^3}.\)
C.\(54\pi {a^3}.\)
D.\(108\pi {a^3}.\)

A.\(S = \pi \int\limits_0^1 {\left( {2{x^2} + 1} \right)dx.} \)                
B.\(S = \int\limits_0^1 {\left( {2{x^2} - 1} \right)dx.} \)                           
C.\(S = \int\limits_0^1 {{{\left( {2{x^2} + 1} \right)}^2}dx.} \)         
D.\(S = \int\limits_0^1 {\left( {2{x^2} + 1} \right)dx.} \)

A.\(2\int\limits_0^2 {{e^u}du.} \)                   
B.\(2\int\limits_0^4 {{e^u}du.} \)    
C.\(\frac{1}{2}\int\limits_0^2 {{e^u}du.} \)        
D.\(\frac{1}{2}\int\limits_0^4 {{e^u}du.} \)

A.\(\left( { - 2;4; - 1} \right).\)                               
B.\(\left( {2; - 4;1} \right).\)       
C.\(\left( {2;4;1} \right).\)         
D.\(\left( { - 2; - 4; - 1} \right)\)

A.\(\overrightarrow {{n_3}}  = \left( {2;3;2} \right).\)  
B.\(\overrightarrow {{n_1}}  = \left( {2;3;0} \right).\)                                
C.\(\overrightarrow {{n_2}}  = \left( {2;3;1} \right).\)      
D.\(\overrightarrow {{n_4}}  = \left( {2;0;3} \right).\)

A.\(P\left( {1;2; - 1} \right).\)       
B.\(M\left( { - 1; - 2;1} \right).\) 
C.\(N\left( {2;3; - 1} \right)\).                            
D.\(Q\left( { - 2; - 3;1} \right).\)