Đáp án:
Giải thích các bước giải:
\(\begin{array}{l}
a.ĐK:x \ge 0;x \ne 9;x \ne 4\\
b.P = \frac{{2\sqrt x - 9 + (2\sqrt x + 1)(\sqrt x - 2) - (x - 9)}}{{\left( {\sqrt x - 3} \right)\left( {\sqrt x - 2} \right)}}\\
= \frac{{2\sqrt x - 9 + 2x - 4\sqrt x + \sqrt x - 2 - x + 9}}{{\left( {\sqrt x - 3} \right)\left( {\sqrt x - 2} \right)}}\\
= \frac{{x - \sqrt x - 2}}{{\left( {\sqrt x - 3} \right)\left( {\sqrt x - 2} \right)}} = \frac{{\left( {\sqrt x - 2} \right)\left( {\sqrt x + 1} \right)}}{{\left( {\sqrt x - 3} \right)\left( {\sqrt x - 2} \right)}}\\
= \frac{{\sqrt x + 1}}{{\sqrt x - 3}}
\end{array}\)