A.\(\overrightarrow {{n_1}}  = \left( {2;4; - 1} \right)\)
B.\(\overrightarrow {{n_2}}  = \left( {2; - \,4;1} \right)\)
C.\(\overrightarrow {{n_3}}  = \left( { - 2;4;1} \right)\)
D.\(\overrightarrow {{n_1}}  = \left( {2;4;1} \right)\)

A.\(x = 8\)
B.\(x =  - 8\)
C.\(x = 3\)
D.\(24\pi \)

A.\(\dfrac{1}{5}{x^5} + C\)
B.\({x^5} + C\)
C.\(5{x^5} + C\)
D.\(20{x^3} + C\)

A.\(\left( {0;4;2} \right)\)
B.\(\left( {1;4;0} \right)\)
C.\(\left( {1;0;2} \right)\)
D.\(\left( {0;0;2} \right)\)

A.\(8\) 
B.\(33\)
C.\(\dfrac{{11}}{3}\)
D.\(14\)

A.\(9\) 
B.\(18\)
C.\(3\)
D.\(6\)

A.\(x = 17\)
B.\(x = 24\)
C.\(x = 2\)
D.\(x = 40\)

A.\( - 3\) 
B.\(3\)
C.\(4\)
D.\(5\)

A.\(Q\left( {4; - 2;1} \right).\)
B.\(N\left( {4;2;1} \right).\)
C.\(P\left( {2;1; - 3} \right).\)
D.\(M\left( {2;1;3} \right).\)

A.\(4\)
B.\( - 3\)
C.\(3\)
D.\( - 4\)