\(P=\dfrac{x+\sqrt{x}-x+\sqrt{x}}{\left(\sqrt{x}-1\right)\left(\sqrt{x}+1\right)}\cdot\dfrac{-\left(\sqrt{x}-1\right)\left(\sqrt{x}+1\right)}{2x\sqrt{x}}\\ P=\dfrac{-2\sqrt{x}}{2x\sqrt{x}}=-\dfrac{1}{x}\)
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