flalign

hbghlyj

flalign and flalign*: Similar to align, but left aligns first equation column, and right aligns last column

Wikibook

测试:

\documentclass{article}
\usepackage{amsmath}
\begin{document}
\noindent The formula is
\begin{flalign*}
a &= b+c\\
  &= 1+1\\
  &= 2
\end{flalign*}
\end{document}

参考Use flalign or alignat or align or similar environment to align to the left,需要每行最后加一个 & 才行:

\documentclass{article}
\usepackage{amsmath}
\begin{document}
\noindent The formula is
\begin{flalign*}
a &= b+c &\\
  &= 1+1 &\\
  &= 2 &
\end{flalign*}
\end{document}

kuing

第二段并不需要每行都加，只需某一行加就行，比如

1. \documentclass{article}
2. \usepackage{amsmath}
3. \begin{document}
4. \noindent The formula is
5. \begin{flalign*}
6. a &= b+c\\
7.   &= 1+1\\
8.   &= 2 &
9. \end{flalign*}
10. \end{document}

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