\(\frac{2-x}{2011}-1=\frac{1-x}{2012}-\frac{x}{2013}\)
\(\Leftrightarrow\frac{2013-x}{2011}=\frac{2013-x}{2012}+\frac{2013-x}{2013}\)
\(\Leftrightarrow\left(2013-x\right)\left(\frac{1}{2011}-\frac{1}{2012}-\frac{1}{2013}\right)=0\)
\(\Leftrightarrow2013-x=0\) (Vì \(\frac{1}{2011}-\frac{1}{2012}-\frac{1}{2013}\ne0\forall x\))
\(\Leftrightarrow x=2013\)
\(Vậy\) \(phương\) \(trình\) \(có\) \(nghiệm\) \(x=2013\).
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