Toán Lớp 7: x 3 -2x =0

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2. $$\begin{gathered} x^3–2x=0 \\ \Rightarrow x\times \left(x^2+2\right)=0 \\ \Rightarrow \left\{\begin{array}{l}x=0\\ x^2–2=0\end{array}\right. \end{gathered}$$

   $$\begin{gathered} \Rightarrow \left\{\begin{array}{l}x=0\\ x^2=2\end{array}\right. \\ \Rightarrow \left\{\begin{array}{l}x=0\\ x=\sqrt{2}\end{array}\right. \end{gathered}$$

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