\(\begin{array}{l}
= \dfrac{{\sqrt x (x\sqrt x - 1)}}{{(\sqrt x + 1)(x + \sqrt x + 1)}} - \dfrac{{x - 3}}{{\sqrt x + 1}}\\
= \dfrac{{\sqrt x (\sqrt x - 1)(x + \sqrt x + 1)}}{{(\sqrt x + 1)(x + \sqrt x + 1)}} - \dfrac{{x - 3}}{{\sqrt x + 1}}\\
= \dfrac{{x - \sqrt x - (x - 3)}}{{\sqrt x + 1}}\\
= \dfrac{{3 - \sqrt x }}{{\sqrt x + 1}}
\end{array}\)
