\(A=\left(\dfrac{1}{\sqrt{x}\left(\sqrt{x}+2\right)}-\dfrac{\sqrt{x}}{\sqrt{x}\left(\sqrt{x}+2\right)}\right):\left(\dfrac{1-\sqrt{x}}{\left(\sqrt{x}+2\right)^2}\right)\)
\(=\left(\dfrac{1-\sqrt{x}}{\sqrt{x}\left(\sqrt{x}+2\right)}\right).\dfrac{\left(\sqrt{x}+2\right)^2}{\left(1-\sqrt{x}\right)}=\dfrac{\sqrt{x}+2}{\sqrt{x}}\)