1. Calculate: $2015 \times 2015-2014 \times 2013=(\quad)$.
\begin{aligned} \text { [Analysis] } & (2014+1) \times 2015-2014 \times 2013 \\ = & 2014 \times 2015-2014 \times 2013+2015 \\ = & 2014 \times(2015-2013)+2015=6043\end{aligned}