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