测试LaTeX 

$$\LaTeX{}$$

$$\begin{aligned}\frac{\partial \pi}{\partial w} &\overset{!}{=}0\\
e &= e^{\min} \end{aligned}$$

测试LaTeX 

$$\href{www.overleaf.com\/learn\/latex\/hyperlinks}{Hyperlink}$$

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测试LaTeX 

$$\begin{table}[]
\begin{tabular}{lllll}
h & e & l & l & o \\
w & o & r & l & d \\
1 & 2 & 3 & 4 & 5 \\
上 & 山 & 打 & 老 & 虎
\end{tabular}
\end{table}$$

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测试markdown 

```html
<h1>hello world</h1>
```

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