9-10-2.tex

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% 9-10-2.tex
\documentclass{article}
\usepackage{amsmath}
\usepackage{CJK}
\newcommand*{\me}{\mathrm{e}}
\begin{document}
\begin{CJK*}{GBK}{song}
\CJKtilde
\begin{align}
    \text{圆周率~}\pi & \approx 3.1415926535897932384626\\
    \text{自然对数的底~}\me & \approx 2.718281828459045
\end{align}

\begin{align*}
    (x^n)' &= nx^{n-1}  &(\sin x)' &= \cos x\\
    (a^x)' &= a^x\ln a  &(\cos x)' &= -\sin x\\
           &            &(\tan x)' &= \frac1{\cos^2x}
\end{align*}

\begin{flalign*}
    (x^n)' &= nx^{n-1}  &(\sin x)' &= \cos x\\
    (a^x)' &= a^x\ln a  &(\cos x)' &= -\sin x\\
           &            &(\tan x)' &= \frac1{\cos^2x}
\end{flalign*}
\end{CJK*}
\end{document}