\(\left|x-2016\right|-\left|2015-x\right|\)
\(\left|2016-x\right|-\left|2015-x\right|\)
\(\ge\left|2016-x-2015+x\right|=1\)
Dấu "=" \(\Leftrightarrow\left(2016-x\right)\left(2015-x\right)\ge0\)
\(\Leftrightarrow\left\{{}\begin{matrix}x\le2016\\x\le2015\end{matrix}\right.\)