$E=\dfrac{3x+9\sqrt{x}-3}{x+\sqrt{x}-2}-\dfrac{\sqrt{x}+1}{\sqrt{x}+2}+\dfrac{\sqrt{x}-2}{1-\sqrt{x}}$
ĐKXĐ: $x \ge 0,\ x \ne 1$
$E=\dfrac{3x+9\sqrt{x}-3}{x+\sqrt{x}-2}-\dfrac{\sqrt{x}+1}
{\sqrt{x}+2}+\dfrac{\sqrt{x}-2}{1-\sqrt{x}}$
$\iff E=\dfrac{3x+9\sqrt{x}-3}{(\sqrt{x}-1)(\sqrt{x}+2)}-\dfrac{(\sqrt{x}+1)(\sqrt{x}-1)}
{(\sqrt{x}-1)(\sqrt{x}+2)}-\dfrac{\sqrt{x}-2)(\sqrt{x}+2)}{(\sqrt{x}-1)(\sqrt{x}+2)}$
$\iff E=\dfrac{3x+9\sqrt{x}-3-x+1-x+4}{(\sqrt{x}-1)(\sqrt{x}+2)}$
$\iff E=\dfrac{x+9\sqrt{x}+2}{(\sqrt{x}-1)(\sqrt{x}+2)}$