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答案1
两个选项:
一个使用专用aligned
环境。另一个使用专用环境\mkern<space>
。示例如下:
\documentclass[10pt,a4paper]{article}
\usepackage[latin1]{inputenc}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{graphicx}
\begin{document}
\[
\left\{
\begin{aligned}
x + y = 1\\ x - y = 2
\end{aligned}\right.
\]
\[\left\{\mkern-10mu\begin{array}{l} x + y = 1\\ x - y = 2 \end{array}\right.\]
\end{document}
这将给你:
答案2
有两种方法:
\documentclass[10pt,a4paper]{article}
\usepackage{mathtools, empheq}
\newtagform{eqt}{(eqt\,}{)}
\begin{document}
\[ \left\{\begin{array}{@{}l} x + y = 1 \\ x - y = 2 \end{array}\right.\]
\begin{empheq}[left=\empheqlbrace]{align*}
x + y & = 1\\ x - y & = 2
\end{empheq}
\[\begin{cases} x+y=1 \\ x-y=2\end{cases}.\]
\end{document}