Cho hàm số \(y = f\left( x \right)\) có đạo hàm \(f'\left( x \right) < {\rm{ }}0\,\,\forall x \in \mathbb{R}\). Tìm \(x\) để \(f\left( {\dfrac{1}{x}} \right) > f\left( 2 \right).\)
A.\(\left( { - \infty ;0} \right) \cup \left( {\dfrac{1}{2}; + \infty } \right)\)
B.\(\left( { - \infty ;\dfrac{1}{2}} \right)\)
C.\(\left( { - \infty ;0} \right) \cup \left( {0;\dfrac{1}{2}} \right)\)
D.\(\left( {0;\dfrac{1}{2}} \right)\)
A.\(\left( { - \infty ;0} \right) \cup \left( {\dfrac{1}{2}; + \infty } \right)\)
B.\(\left( { - \infty ;\dfrac{1}{2}} \right)\)
C.\(\left( { - \infty ;0} \right) \cup \left( {0;\dfrac{1}{2}} \right)\)
D.\(\left( {0;\dfrac{1}{2}} \right)\)
Loga
Hóa Học lớp 12
