A.
B.
C.
D.

A.\(\left( {\frac{5}{4}; + \infty } \right)\)
B.\(\left( {1;\frac{5}{4}} \right)\)
C.\(\left( { - \infty ;2} \right)\)
D.\(\left( {1;5} \right)\)

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

A.\(\left( {8;2} \right)\)
B.\(\left( {1;8} \right)\)
C.\(\left( {8; - 1} \right)\)
D.\(\left( {2;8} \right)\)

A.\( - 6\)
B.\( - 2\)
C.\(2\)
D.\(6\)

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

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

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

A.\(i\)
B.\( - 5\)
C.\(3\)
D.\(5\)

A.\({a^3}\)
B.\(3\sqrt 3 {a^3}\)
C.\(4{a^3}\)
D.\(2{a^3}\)