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