test</script>
soha
2019-02-11 13:30:58
$$ 123
45678 $$
$$ \begin{aligned}
F(n)&=\sum_{i=1}^n \operatorname{lcm}(i,b)\\
&=b\sum_{i=1}^n \dfrac{i}{\gcd(i,b)}\\
&=b\sum_{d\mid b}\sum_{i=1}^{n/d} i[\gcd(i,\dfrac{b}{d})=1]\\
&=b\sum_{d\mid b}\sum_{k\mid\frac{b}{d}}\mu(k)k\sum_{i=1}^{n/dk} i\\
&=b\sum_{T\mid b}\sum_{k\mid T}\mu(k)k\sum_{i=1}^{n/T}i
\end{aligned}
$$
$$
12345678
$$
$$12345678$$
# h1 1 $\LaTeX$
## h2 1
### h3 1
## h2 2
### h3 2
## h2 3
## h2 4
### h3 3
# h1 2
# h1 3
## h2 5
# h1 4
### h3 4
# h1 5
## h2 6
### h3 5
## h2 7
# h1 6
### h3 6
## h2 8
## h2 9
### h3 7
### h3 8
### h3 9
### h3 a
### h3 b
### h3 c
## h2 a
## h2 b
## h2 c
### h3 d
### h3 e
## h2 d
### h3 f
```php
$test=233;
var_dump($test);
```
```cpp
#define mian main
#define bao int
#define hao int
#define dailai scanf
#define daizou printf
#define gaoci return 0
#include<stdio.h>
bao mian(){
hao chi;
hao wan;
dailai("%d %d",&chi,&wan);
hao huai=chi+wan;
daizou("%d",huai);
gaoci;
}
```
```python
import flask
app = flask.Flask("SAM Drawer")
@app.route("/")
def home()->str:
return "qwq"
def main()->None:
app.run(port=8080)
if __name__ == "__main__":
main()
```
<$>
<$>
```
<$>
hjggjhg$nbkjj
```
$(a+b)$
> 引用一些东西
> 引用一些东西
> 引用一些东西
> 引用一些东西
> 引用一些东西
> 引用一些东西
> 引用一些东西
