$2x^{2}-3x+2=x\sqrt{3x-2}$

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đặt ẩn phụ –  ๖ۣۜJinღ๖ۣۜKaido 06-06-16 08:34 PM
Đặt $a=x;b=\sqrt{3x-2}$ $DK:x\geq \frac{2}{3}$
$pt\Leftrightarrow 2a^2-b^2=ab\Leftrightarrow (2a+b)(a-b)=0$
$\Rightarrow 2a+b=0$(loại)
$a=b\Rightarrow x=\sqrt{3x-2}$
$\Leftrightarrow x^2-3x+2=0\Rightarrow x=1;2$(nhận hết)
đúng click "V" nhek ku –  ๖ۣۜJinღ๖ۣۜKaido 06-06-16 08:39 PM

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