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如图:
演示代码:
\documentclass{article} \setlength\textwidth{245.0pt} \usepackage{CJK} \usepackage{indentfirst} \usepackage{amsmath}
\begin{CJK*}{GBK}{song} \begin{document} 方法一:
$$ f(x)=\left\{ \begin{aligned} x & = & \cos(t) \\ y & = & \sin(t) \\ z & = & \frac xy \end{aligned} \right. $$
方法二:
$$ F^{HLLC}=\left\{ \begin{array}{rcl} F_L & & {0 < S_L}\\ F^*_L & & {S_L \leq 0 < S_M}\\ F^*_R & & {S_M \leq 0 < S_R}\\ F_R & & {S_R \leq 0} \end{array} \right. $$
方法三:
$$f(x)= \begin{cases} 0& \text{x=0}\\ 1& \text{x!=0} \end{cases}$$
\end{CJK*} \end{document}
