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答案1
这是一个开始。正如上面的评论所解释的那样,你想要的东西似乎很容易获得,但我懒得重新输入整个内容 :-)
\documentclass[12pt]{report}
\usepackage{mathtools}
\begin{document}
\begin{equation*}
\begin{aligned}
\mathcal{D}_{ik}(t) =
&\sum_{j=1}^{\lfloor \frac{c}{d} \rfloor} \Bigg( \prod_{i=1}^{n} \Big( \text{some stuff} \Big) \Bigg)\\
& + {} \text{some other stuff}
\end{aligned}
\end{equation*}
\end{document}