*Nếu \(m+n+2017\ne0\)thì theo t/c dãy tỉ số bằng nhau, ta được:
\(x=\frac{m}{n+2017}=\frac{n}{n+2017}=\frac{2017}{m+n}=\frac{1}{2}\)
*Nếu \(m+n+2017=0\)thì \(\hept{\begin{cases}m+n=-2017\\m+2017=-n\\n+2017=-m\end{cases}}\)
\(\Rightarrow x=\frac{m}{-m}=\frac{n}{-n}=\frac{2017}{-2017}=-1\)