Tìm x biết rằng: 3 x^2 = 2x

* Hướng dẫn giải

$\begin{array}{l}3x^2=2x\\ 3x^2-2x=0\\ x\left(3x-2\right)=0\\ \Rightarrow \left[\begin{array}{l}x=0\\ 3x-2=0\end{array}\right.\\ \Rightarrow \left[\begin{array}{l}x=0\\ x=\frac{2}{3}\end{array}\right.\end{array}$

Vậy $x\in \left\{0;\frac{2}{3}\right\}$