Rút gọn biểu thức: A=√x/√x−6−6/√x+6 (với x≥0,x≠36)

\(A = \frac{{\sqrt x }}{{\sqrt x - 6}} - \frac{6}{{\sqrt x + 6}} = \frac{{\sqrt x \left( {\sqrt x + 6} \right)}}{{\left( {\sqrt x - 6} \right)\left( {\sqrt x + 6} \right)}} - \frac{{6\left( {\sqrt x - 6} \right)}}{{\left( {\sqrt x - 6} \right)\left( {\sqrt x + 6} \right)}}\)

\( = \frac{{x + 6\sqrt x - 6\sqrt x + 36}}{{\left( {\sqrt x - 6} \right)\left( {\sqrt x + 6} \right)}} = \frac{{x + 36}}{{x - 36}}\)