Giúp em vs anh chị ơi huhuhu

Ta có: 

$P = \dfrac{3x + \sqrt{9x} - 3}{(\sqrt{x} + 2)(\sqrt{x} - 1)} - \dfrac{\sqrt{x} + 1}{\sqrt{x} + 2} - \dfrac{\sqrt{x} - 2}{\sqrt{x} - 1}$ 

$P = \dfrac{3x + 3\sqrt{x} - 3 - (\sqrt{x} + 1)(\sqrt{x} - 1) - (\sqrt{x} - 2)(\sqrt{x} + 2)}{(\sqrt{x} + 2)(\sqrt{x} - 1)}$ 

$P = \dfrac{3x + 3\sqrt{x} - 3 - x + 1 - x + 4}{(\sqrt{x} + 2)(\sqrt{x} - 1)}$ 

$P = \dfrac{x + 3\sqrt{x} + 2}{(\sqrt{x} + 2)(\sqrt{x} - 1)}$ 

$P = \dfrac{(\sqrt{x} + 1)(\sqrt{x} + 2)}{(\sqrt{x} + 2)(\sqrt{x} - 1)}$ 

$P = \dfrac{\sqrt{x} + 1}{\sqrt{x} - 1}$