答案1
\documentclass[fleqn]{article}
\usepackage{amsmath}
\begin{document}
\begin{equation}
\begin{split}
a &= b, a = b, a = b,\\
a &= b, \\
a &= b, a = b, \\
a &= b, a = b, a = b,
\end{split}
\end{equation}
where
\begin{equation}
\begin{split}
a &= b,\\
a &= b, a = b,\\
a &= b, a = b, a = b \\
a &= b, a = b.
\end{split}
\end{equation}
\end{document}
答案2
这会将所有方程式左对齐。您可以使用对齐&&&
而不是&
之前对齐来居中它们,但这看起来更像原始的。
\documentclass[fleqn]{article}
\usepackage{amsmath}
\begin{document}
\begin{align}
&\begin{aligned}
a &= b, a = b, a = b,\\
a &= b, \\
a &= b, a = b, \\
a &= b, a = b, a = b,
\end{aligned}
\intertext{where}
&\begin{aligned}
a &= b,\\
a &= b, a = b,\\
a &= b, a = b, a = b, a=b \\
a &= b, a = b.
\end{aligned}
\end{align}
\end{document}