ĐK:.....
$\Leftrightarrow \sqrt{9-5x}-2-(\sqrt{x}-1)-(x^2-1)=0$$\Leftrightarrow \frac{-5(x-1)}{\sqrt{9-5x}+2}-(\sqrt{x}-1)-(x-1)(x+1)=0$
$\Leftrightarrow (\sqrt{x}-1)(\frac{-5(\sqrt{x}+1)}{\sqrt{9-5x}}-1-(\sqrt{x}+1)(x+1))=0$
$\Leftrightarrow x=1(tmđk)$ Cái trong ngoặc sau luôn nhỏ hơn 0
Vậy.......