- Thấy \(\left\{{}\begin{matrix}\left|x+1\right|\ge0\\\left|x-y+5\right|\ge0\end{matrix}\right.\)
\(\Rightarrow\left|x-1\right|+\left|x-y+5\right|\ge0\)
- Dấu " = " xảy ra \(\Leftrightarrow\left\{{}\begin{matrix}x-1=0\\x-y+5=0\end{matrix}\right.\)
\(\Leftrightarrow\left\{{}\begin{matrix}x=1\\y=6\end{matrix}\right.\)
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