---
# System prepended metadata

title: Learn HackMD
tags: [learning markdown]

---

###### tags: `learning markdown`

Learn HackMD
===

> [TOC]
> 


---

# comment

> this a comment[name=Hong ChunBo][time=Mon, May 11, 2020 9:11 AM][color=#db51b4] 
> 
*    *this a list*
*    **list1**
*    ***list2***
    *    sublist1 1^2^
    *    sublist2 1~2~
    *    ==blist3==
        *    ~~list11~~
        *    sublist12
        *    sublist13


---


# block

`this is a block`

    this is a simple code 
    
```clike=
    int main(){
        return 0;
    }
```

---

# link

[baidu](https://www.baidu.com)
# picture

![image](https://ss0.bdstatic.com/94oJfD_bAAcT8t7mm9GUKT-xh_/timg?image&quality=100&size=b4000_4000&sec=1589160501&di=de95b918d15b7e248a75bde04a6ec677&src=http://a3.att.hudong.com/14/75/01300000164186121366756803686.jpg)

![](https://i.imgur.com/eCGqjoI.jpg)

# checklist

checklist
- [ ] 男
- [ ] 女

# table

this is a table
| Column 1 | Column 2 | Column 3 |
| -------- | -------- | -------- |
| java    | python     | c++     |
# LaTex
$\LaTeX$

$$
n(a,b) = (b-1)m
$$
## 加入空格
$7\ months\ +\ 5 months\ =\ 1\ year$

$Lily\ brothe$
## 换行
**二分之一**：$\\ \dfrac{1}{2}$
## 对齐
`where tk=a+(b−a)⋅k/N`
$where\ t_k=a+(b-a)\cdot c/N$

$mathrm{Intergals\ are\ numerically\ approximated\ as\ finite\ series:}\\
\begin{split}
\int_{a}^{b}x(t)dt &= \dfrac{b-a}{N}\\
&\approx\sum_{k-1}^{N}x(t_k)\cdot\dfrac{b-a}{N}\\
\end{split}\\
where t_k = a +(b-a)\cdot k/N$

