a: Ta có: \(P=\left(\dfrac{3-\sqrt{x}}{\sqrt{x}-2}+\dfrac{\sqrt{x}+2}{\sqrt{x}+3}+\dfrac{x-9}{x+\sqrt{x}-9}\right):\left(1-\dfrac{3\sqrt{x}-9}{x-9}\right)\)
\(=\dfrac{9-x+x-4+x-9}{\left(\sqrt{x}-2\right)\left(\sqrt{x}+3\right)}\cdot\dfrac{\left(\sqrt{x}+3\right)\left(\sqrt{x}-3\right)}{x-9-3\sqrt{x}+9}\)
\(=\dfrac{x-4}{\sqrt{x}-2}\cdot\dfrac{\sqrt{x}-3}{x-3\sqrt{x}}\)
\(=\dfrac{\sqrt{x}+2}{\sqrt{x}}\)
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