a: \(P=\dfrac{x-4}{\sqrt{x}\left(\sqrt{x}-2\right)}\cdot\dfrac{\sqrt{x}-2+4\sqrt{x}+8}{x-4}=\dfrac{5\sqrt{x}+6}{\sqrt{x}\left(\sqrt{x}-2\right)}\)
c: P>0
=>căn x-2>0
=>x>4
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