Với mọi \(x;y;z\in R\) ta có:
\(\left(x+y\right)^{2018}+\left|x-1\right|+\left|x+2y-z\right|\ge0\)
Dấu "=" xảy ra khi: \(\left\{{}\begin{matrix}x=-y\\x=1\\x+2y=z\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x=1\\y=-1\\z=-1\end{matrix}\right.\)