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ohmygod1999vn

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lp_qt

$\sqrt[3]{x+1}-\sqrt[3]{x-1}=\sqrt[6]{x^2-1}$

đặt $\left\{\begin{matrix}a=\sqrt[6]{x+1} & \\ b=\sqrt[6]{x-1} & \end{matrix}\right.$

\Rightarrow $a^2-b^2=ab$

\Leftrightarrow $a=...b$

giải ra tìm $x$
 
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