A.
B.
C.
D.

A.
B.
C.
D.

A.\(\dfrac{{f\left( {{x_1}} \right)}}{{f\left( {{x_2}} \right)}} < 1\) với mọi \({x_1},{x_2} \in \mathbb{R};\,\,{x_1} < {x_2}\).
B. \(\dfrac{{f\left( {{x_2}} \right) - f\left( {{x_1}} \right)}}{{{x_2} - {x_1}}} > 0\) với mọi \({x_1},{x_2} \in \mathbb{R}\)
C.\(f\left( {{x_1}} \right) < f\left( {{x_2}} \right)\) với mọi \({x_1},{x_2} \in \mathbb{R};\,\,{x_1} < {x_2}\).
D.\(\dfrac{{f\left( {{x_2}} \right) - f\left( {{x_1}} \right)}}{{{x_2} - {x_1}}} < 0\) với mọi \({x_1},{x_2} \in \mathbb{R};\,\,{x_1} < {x_2}\)

A.\(\left( { - \dfrac{3}{2};0} \right)\)
B.\(\left( { - 2;0} \right)\)
C.\(\left( {0; - 2} \right)\)
D.\(\left( {0;\dfrac{3}{2}} \right)\)

A.3
B.1
C.4
D.2

A.\(\dfrac{{{5^x}}}{{\ln 5}} - \dfrac{{{x^2}}}{2} + C\)
B.\({5^x} - {x^2} + C\)
C.\({5^x}\ln 2 - \dfrac{{{x^2}}}{2} + C\)
D.\(\dfrac{{{5^x}}}{{\ln 5}} - 1 + C\)

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

A.\(\dfrac{1}{4}\)
B.\(\sqrt 3 \)
C.\(\dfrac{{\sqrt 3 }}{6}\)
D.\(\dfrac{{\sqrt 3 }}{3}\)

A.3
B.\( - 5\)
C.25
D.1

A.
B.
C.
D.