\(\left( {2x + 5} \right)\left( {2{x^2} - 1} \righ...

Câu hỏi: \(\left( {2x + 5} \right)\left( {2{x^2} - 1} \right) \le 0\)

A \(x \in \left[ { - \frac{5}{2}; - \frac{{\sqrt 2 }}{2}} \right) \cup \left( {\frac{{\sqrt 2 }}{2}; + \infty } \right)\)

B \(x \in \left( { - \infty ; - \frac{{\sqrt 2 }}{2}} \right) \cup \left( {\frac{{\sqrt 2 }}{2}; + \infty } \right)\)

C \(x \in \left( { - \infty ; - \frac{5}{2}} \right] \cup \left[ { - \frac{{\sqrt 2 }}{2};\frac{{\sqrt 2 }}{2}} \right]\)

D \(x \in \left( { - \infty ; - \frac{5}{2}} \right] \cup \left( {\frac{{\sqrt 2 }}{2}; + \infty } \right)\)