1、向量
$\vec a$\qquad
$\overleftarrow{AB}$\qquad
$\overleftrightarrow{AB}$\qquad
$\overrightarrow{AB}$
2、插入图片
1 \section{测试插入图片1}
2 \includegraphics[scale=0.4]{noise.jpg}
3
4 \section{测试插入图片2}
5 \begin{figure}[ht]
6 \includegraphics[scale=0.4]{noise.jpg}
7 \caption{figure1. 测试图示2}
8 \label{figl}
9 \end{figure}
10
11 \section{测试插入图片3}
12 \begin{figure}[ht]
13 \includegraphics[scale=1]{C:/Users/gaoyixue/Desktop/temp4.jpg}
14 \end{figure}
3、插入编号
\begin{itemize}
\item latex1
\item latex2
\item latex3
\end{itemize}
\begin{itemize}
\item[1] latex1
\item[2] latex2
\item[3] latex3
\end{itemize}
\begin{enumerate}
\item latex1
\item latex2
\item latex3
\end{enumerate}
\begin{enumerate}
\item[(1)] latex1
\item[(2)] latex2
\item[(3)] latex3
\end{enumerate}