\(\left(x^2-5\right)\left(x^2-10\right)< 0\)
\(\Rightarrow\left[\begin{array}{nghiempt}x^2-5< 0\\x^2-10< 0\end{array}\right.\)
\(\Rightarrow\left[\begin{array}{nghiempt}x^2< 5\\x^2< 10\end{array}\right.\)
\(\Rightarrow\left[\begin{array}{nghiempt}x^2=4\\x^2=9\end{array}\right.\) \(\Rightarrow\left[\begin{array}{nghiempt}x=\sqrt{4}\\x=\sqrt{9}\end{array}\right.\)
\(\Rightarrow\left[\begin{array}{nghiempt}x=2\\x=3\end{array}\right.\)
Vậy: \(x\in\left\{2;3\right\}\)
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