a) y = \(\dfrac{x^2}{\left|x\right|}\)=\(\left\{{}\begin{matrix}x\sim x>0\\-x\sim x< 0\end{matrix}\right.\) ( Dẫu ~ là với nhé :v )
b) y = \(\dfrac{1}{2}\left(3x+\left|x\right|\right)=\left\{{}\begin{matrix}x\sim x< 0\\2x\sim x\ge0\end{matrix}\right.\)