$\sqrt{3x^{2}-7x+3} -\sqrt{x^{2}-2}=\sqrt{3x^{2}-5x-1}-\sqrt{x^{2}-3x+4}$
Jin bận rồi............. –  ๖ۣۜJinღ๖ۣۜKaido 12-09-15 11:52 AM
biết thì giúp chiuu vs –  Salim 11-09-15 10:57 PM
cái này là phương trình vô tỷ đó –  ๖ۣۜJinღ๖ۣۜKaido 11-09-15 10:54 PM

Đk $x \geq \frac{5+\sqrt{37}}{6}$ hoặc $x \leq -\sqrt{2}$
$(\sqrt{3x^2-7x+3}-\sqrt{3x^2-5x-1})+(\sqrt{x^2-3x+4}-\sqrt{x^2-2})=0$
$\Rightarrow \frac{3x^2-7x+3-3x^2+5x+1}{\sqrt{3x^2-7x+3}+\sqrt{3x^2-5x-1}}+\frac{x^2-3x+4-x^2+2}{\sqrt{x^2-3x+4}+\sqrt{x^2-2}}=0$
$\Rightarrow-(x-2)(\frac{2}{\sqrt{3x^2-7x+3}+\sqrt{3x^2-5x-1}}+\frac{3}{\sqrt{x^2-3x+4}+\sqrt{x^2-2}})=0$
Vì $\frac{2}{\sqrt{3x^2-7x+3}+\sqrt{3x^2-5x-1}}+\frac{3}{\sqrt{x^2-3x+4}+\sqrt{x^2-2}}>0$
$\Rightarrow x=2 $ (thõa đk)
Vậy $\color{red}{\boxed{x=2}}$
dạ mới 10 à –  tran85295 12-09-15 05:17 PM
ko sao, mà e năm nay 12 ak? –  ★★.P.I.N.O.★★ 12-09-15 05:14 PM
em ko bít –  tran85295 12-09-15 05:08 PM
ủa bài anh đăng ttruoc rồi à –  tran85295 12-09-15 05:08 PM
viết lại bài của a làm gì vậy? –  ★★.P.I.N.O.★★ 12-09-15 02:15 PM
  Điều kiện xác định: $\left[ \begin{array}{l} x \ge \frac{5+ \sqrt {37}}{6}\\ x \le -\sqrt 2 \end{array} \right.$  
      $\sqrt{3x^{2}-7x+3} -\sqrt{x^{2}-2}=\sqrt{3x^{2}-5x-1}-\sqrt{x^{2}-3x+4}$ 
$\Leftrightarrow \sqrt{3x^{2}-7x+3} -\sqrt{3x^{2}-5x-1}=\sqrt{x^{2}-2}-\sqrt{x^{2}-3x+4}$
$\Leftrightarrow \frac{-2x+4}{\sqrt{3x^{2}-7x+3} + \sqrt{3x^{2}-5x-1}}=\frac{3x-6}{\sqrt{x^{2}-2}+\sqrt{x^{2}-3x+4}}$
$\Leftrightarrow (x-2)(\underbrace{\frac{3}{\sqrt{x^{2}-2}+\sqrt{x^{2}-3x+4}}+\frac{2}{\sqrt{3x^{2}-7x+3} + \sqrt{3x^{2}-5x-1}}}_{>0,\forall x \text{ thuộc ĐKXĐ}})=0$ 
$\Leftrightarrow x=2.$ ($tm$)
Vậy phương trình đã cho có nghiệm duy nhất là $\color{red}{\boxed{x=2}.}$
cảm ơn 2 anh nhiều nhá :) –  Salim 12-09-15 06:22 PM

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