1) \[ \left( \frac{\sqrt{x}}{\sqrt{x+3}} + \frac{6\sqrt{x} + 1}{x-9} \right) : \frac{\sqrt{x}}{1} \] \[ \left( \frac{1}{2\sqrt{a}-1} + \frac{3}{1-4a\sqrt{a}} - \frac{2}{4a+1} \right) : \left( \frac{4a+1+1}{4a-1} \right) \] \[ \frac{1}{2\sqrt{x}-2} + \frac{1}{2\sqrt{x}+2} \] \[ -\frac{\sqrt{1-\sqrt{2}}}{\sqrt{a-2}} + \frac{\sqrt{2}}{\sqrt{a-2}+\sqrt{2}} : \frac{\sqrt{a-\sqrt{6}}}{a-2} \] \[ \frac{2\sqrt{a}-a}{\sqrt{a+3}} \left( \frac{\sqrt{a-2}-\sqrt{a+2}}{\sqrt{a+2}-\sqrt{a-2}} + \frac{4c}{4-a} \right) \] \[ \left( \frac{\sqrt{x+1}}{\sqrt{x-1}} - \frac{\sqrt{x-1}}{\sqrt{x+1}} + \frac{x-4\sqrt{x}-1}{x-1} \right) \] \[ \left( \frac{\sqrt{a}-1}{3(a-1)} + \frac{8\sqrt{a}}{9a-1} \right) \] \[ \left( \frac{2+\sqrt{2}}{2-\sqrt{2}} - \frac{4x}{x-4} - \frac{2-\sqrt{x}}{2\sqrt{x}} \right) : \frac{-\sqrt{x}}{2-\sqrt{x}} \] 4 \[ \frac{1}{\sqrt{x-1}} \]