Ta có: $2\left | x \right |=\sqrt{12}$ suy ra $2\left | x \right |=2\sqrt{3}$ suy ra $\left | x \right |=\sqrt{3}$ suy ra $x=\pm\sqrt{3}$
Ta có: $2\left | x \right |=\sqrt{12}$ suy ra $2\left | x \right |=2\sqrt{3}$ suy ra $\left | x \right |=\sqrt{3}$ suy ra $x=\pm\sqrt{3}$