b: \(=\dfrac{2}{\sqrt{x}-2}:\dfrac{\sqrt{x}+\sqrt{x}+2}{x-4}\)
\(=\dfrac{2}{\sqrt{x}-2}\cdot\dfrac{x-4}{2\left(\sqrt{x}+1\right)}=\dfrac{\sqrt{x}+2}{\sqrt{x}+1}\)
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