Question

giúp em đi ạ. em cần gấp ý

Answer 1

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

\(=\sqrt{x}-3+\sqrt{x}-3=2\sqrt{x}-6\)