$\begin{array}{l} Dkxd:a > 0\\ A = \dfrac{{{a^2} + \sqrt a }}{{a - \sqrt a + 1}} - \dfrac{{2a + \sqrt a }}{{\sqrt a }} + 1\\ = \dfrac{{\sqrt a \left( {a\sqrt a + 1} \right)}}{{a - \sqrt a + 1}} - \dfrac{{\sqrt a \left( {2\sqrt a + 1} \right)}}{{\sqrt a }} + 1\\ = \dfrac{{\sqrt a \left( {\sqrt a + 1} \right)\left( {a - \sqrt a + 1} \right)}}{{a - \sqrt a + 1}} - \left( {2\sqrt a + 1} \right) + 1\\ = \sqrt a \left( {\sqrt a + 1} \right) - 2\sqrt a - 1 + 1\\ = a - \sqrt a \end{array}$
