Question

Giúp mình câu này với

Answer 1

\(D=\dfrac{\sqrt{x}-\sqrt{x}+3}{\sqrt{x}\left(\sqrt{x}-3\right)}:\dfrac{x-9-x+4}{\left(\sqrt{x}-3\right)\left(\sqrt{x}-2\right)}\)

\(=\dfrac{3}{\sqrt{x}\left(\sqrt{x}-3\right)}\cdot\dfrac{\left(\sqrt{x}-3\right)\left(\sqrt{x}-2\right)}{-5}\)

\(=\dfrac{-3\left(\sqrt{x}-2\right)}{5\sqrt{x}}\)