08/09/17 12:43:55 W5VFHymx0
\begin{eqnarray}
x =
\left\{ \begin{array}{ll}
\sum\limits_{i=1}^{10} i & (i\neq 5)\\
100 & (i=5)
\end{array} \right.
\end{eqnarray}
08/09/17 12:43:55 W5VFHymx0
\begin{eqnarray}
x =
\left\{ \begin{array}{ll}
\sum\limits_{i=1}^{10} i & (i\neq 5)\\
100 & (i=5)
\end{array} \right.
\end{eqnarray}