e)
\(=\dfrac{\left(\sqrt{a}-\sqrt{x}\right)^2}{\sqrt{a}-\sqrt{x}}+\dfrac{\sqrt{ax}\left(\sqrt{a}+\sqrt{x}\right)}{\sqrt{ax}}\)
\(=\sqrt{a}-\sqrt{x}+\sqrt{a}+\sqrt{x}=2\sqrt{a}\)
f: \(\dfrac{a-6\sqrt{a}+9}{3-\sqrt{a}}+\dfrac{a+3\sqrt{a}}{\sqrt{a}+3}\)
\(=3-\sqrt{a}+\sqrt{a}\)
=3