A.\(2 + {\log _a}b\)
B.\(\dfrac{1}{2} - {\log _a}b\)
C.\(\dfrac{1}{2} + {\log _a}b\)
D.\(2 - {\log _a}b\)

A.\(y = 2\)
B.\(y = \dfrac{3}{4}\)
C.\(y =  - 3\)
D.\(x =  - 3\)

A.5
B.2
C.10
D.20

A.\(\dfrac{{ab + 1}}{{a\left( {8 - 5b} \right)}}\)
B.\(\dfrac{{ab - 1}}{{a\left( {8 + 5b} \right)}}\)
C.\(\dfrac{{2ab + 1}}{{8a - 5b}}\)
D.\(\dfrac{{2ab + 1}}{{8a + 5b}}\)

A.\(y = \dfrac{{x + 2}}{{x - 2}}\)
B.\(y =  - {x^3} + 3{x^2} - 1\)
C.\(y = \dfrac{{x - 1}}{{x - 2}}\)
D.\(y = {x^4} - 3{x^2} + 2\)

A.\(\left\{ { - 1;0;1} \right\}\)
B.\(\left[ { - \sqrt 3 ;\sqrt 3 } \right]\)
C.\(\left( { - \sqrt 3 ;\sqrt 3 } \right)\)
D.\(\left( { - 3;3} \right)\)

A.\(f\left( x \right) = 6x + 2 + C\)               
B.\(f\left( x \right) = {x^3} + {x^2} - 3x + C\)
C.\(f\left( x \right) = 6x + 2\)                         
D.\(f\left( x \right) = {x^3} + {x^2} - 3x\)

A.\({90^0}\)
B.\({45^0}\)
C.\({30^0}\)
D.\({60^0}\)

A.\(\left\{ \begin{array}{l}x = 3 + 2t\\y = 4\\z =  - 2 + 5t\end{array} \right.\)
B.\(\left\{ \begin{array}{l}x = 3 - 2t\\y = 4 + 5t\\z =  - 2 - 3t\end{array} \right.\)
C.\(\left\{ \begin{array}{l}x = 3 + 2t\\y = 4\\z =  - 2 - 5t\end{array} \right.\)
D.\(\left\{ \begin{array}{l}x = 3 + 2t\\y = 4 + 5t\\z =  - 2 - 3t\end{array} \right.\)

A.\(\dfrac{{11}}{4}\)
B.\(\dfrac{1}{2}\)
C.\(\dfrac{{11\pi }}{4}\)
D.\(\dfrac{\pi }{2}\)