Q ≥2 =>\(\frac{1}{\sqrt{x}-2}\) ≥2
=>\(\frac{1}{\sqrt{x}-2}\)-2 ≥0
=>\(\frac{1}{\sqrt{x}-2}\)-\(\frac{2\left(\sqrt{x}-2\right)}{\sqrt{x}-2}\)≥0
=> \(\frac{5-2\sqrt{x}}{\sqrt{x}-2}\)≥0
=>\(\left[{}\begin{matrix}\left\{{}\begin{matrix}5-2\sqrt{x}\ge0\\\sqrt{x}-2>0\end{matrix}\right.\\\left\{{}\begin{matrix}5-2\sqrt{x}\le0\\\sqrt{x}-2< 0\end{matrix}\right.\end{matrix}\right.=>\left[{}\begin{matrix}\left\{{}\begin{matrix}x\le\frac{25}{4}\\x>4\end{matrix}\right.\\\left\{{}\begin{matrix}\sqrt{x}\ge\frac{25}{4}\\x< 4\end{matrix}\right.\end{matrix}\right.=>4< x< \frac{25}{4}\)
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