Ta có :
\(\left\{{}\begin{matrix}\left|x\right|\ge0\\\left|y\right|\ge0\\\left|z\right|\ge0\end{matrix}\right.\)
\(\Leftrightarrow\left|x\right|+\left|y\right|+\left|z\right|\ge0\)
Mà \(\left|x\right|+\left|y\right|+\left|z\right|=0\)
\(\Leftrightarrow\left\{{}\begin{matrix}\left|x\right|=0\\\left|y\right|=0\\\left|z\right|=0\end{matrix}\right.\)
\(\Leftrightarrow\left\{{}\begin{matrix}x=0\\y=0\\z=0\end{matrix}\right.\)
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