ĐK....
\Leftrightarrow $ \sqrt{3x^2-7x+3}-\sqrt{3x^2-5x-1} =\sqrt{x^2-2}-\sqrt{x^2-3x+4} $
[tex]\Leftrightarrow \frac{-2x+4}{\sqrt{3x^2-7x+3}+\sqrt{3x^2-5x-1}}=\frac{3x-6}{\sqrt{x^2-2}+\sqrt{x^2-3x+4}[/tex]
[tex]\Leftrightarrow \left[\begin{ x=2 \\ \frac{-2}{\sqrt{3x^2-7x+3}+\sqrt{3x^2-5x-1}}=\frac{3}{\sqrt{x^2-2}+\sqrt{x^2-3x+4}}(*) \ (VN) \ do \ VT <0, \ VP >0[/tex]