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考虑用 `align` 环境
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````tex \[ \max P_{I_1k} = \sum (f_{I_1j} \times v - c_1 \times d_{1jk}) \] \begin{equation} s.t.\left\{ \begin{aligned} d_{1jk} &= \sum (f_{I_1j} \times v - c_1 \times d_{1jk}) \\ d_{1jk} &\leq d_{1\max} \\ f_{ij} &= a_{ij} \times F \\ I_1 &= \sum_{i = 0} i \end{aligned} \right. \end{equation} ```` ![](https://pics.latexstudio.net/data/images/202003/785b3339583cc53.png)

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