由于方程太长，将其拆分为三行

Question

我怎样才能分割超出边界的下列方程？

\begin{align}
f_4(s)=\\
 \sum_{i=0}^{\Delta_1-1}{\frac{1}{i!}[(-s)^i  \frac{\delta^i}{\delta(s)^i}(\exp(-s^{\frac{2}{\alpha}} \lambda_1 (\eta_1 P_1)^{\frac{2}{\alpha}}C(\alpha,\psi_1))
(\exp(-s^{\frac{2}{\alpha}} \lambda_2 (\eta_2 P_2)^{\frac{2}{\alpha}}C(\alpha,\psi_2))}
\label{eq17}
\end{align}

Answer 1

使用时multline您只需\\改变线路即可。

\begin{multline}
f_4(s)=\sum_{i=0}^{\Delta_1-1}\frac{1}{i!}
\Big[
(-s)^i \frac{\delta^i}{\delta(s)^i}
\Big( \exp(-s^{\frac{2}{\alpha}} \lambda_1 (\eta_1 P_1)^{\frac{2}{\alpha}}C(\alpha,\psi_1) \Big)  \\
\Big( \exp(-s^{\frac{2}{\alpha}} \lambda_2 (\eta_2 P_2)^{\frac{2}{\alpha}}C(\alpha,\psi_2) \Big)
\Big] 
\label{eq17}
\end{multline}