Hàm số \(y = x + \left| x \right|\) được viết lại:

Câu hỏi: Hàm số \(y = x + \left| x \right|\) được viết lại:

A. \(y = \left\{ \begin{array}{l}2x\,\,\,\,\,\,{\rm{khi}}\,\,x \le 0\\0\,\,\,\,\,\,\,\,\,\,{\rm{khi }}x > 0\end{array} \right.\)

B. \(y = \left\{ \begin{array}{l}0\,\,\,\,\,\,\,{\rm{khi}}\,\,x \le 0\\2x\,\,\,\,{\rm{khi }}x > 0\end{array} \right.\)

C. \(y = \left\{ \begin{array}{l} - 2x\,\,\,\,\,\,\,{\rm{khi}}\,\,x \le 0\\0\,\,\,\,\,\,\,\,\,\,\,\,\,{\rm{khi }}x >  - 2\end{array} \right.\)

D. \(y = \left\{ \begin{array}{l}x\,\,\,\,\,\,\,{\rm{khi}}\,\,x \le 0\\2x\,\,\,\,{\rm{khi }}x > 0\end{array} \right.\)