Question

Giúp mình với ạ

Answer 1

a: \(P=\dfrac{2x+2+x+\sqrt{x}+1}{\sqrt{x}}-\dfrac{\sqrt{x}\left(\sqrt{x}+1\right)\left(x-\sqrt{x}+1\right)}{x\left(\sqrt{x}+1\right)}\)

\(=\dfrac{3x+\sqrt{x}+3}{\sqrt{x}}-\dfrac{x-\sqrt{x}+1}{\sqrt{x}}\)

\(=\dfrac{2x+2\sqrt{x}+2}{\sqrt{x}}\)

b: Khi \(x=3-2\sqrt{2}\) thì \(P=\dfrac{6-4\sqrt{2}+2\sqrt{2}-2+2}{\sqrt{2}-1}=\dfrac{6-2\sqrt{2}}{\sqrt{2}-1}=4\sqrt{2}+2\)