#include<bits/stdc++.h>
Inline math test
When $ a \neq 0 $, we can find $$ x=\frac{-b\pm\sqrt{b^2-4ac}}{2a} $$ helloworld123456789 你好
#include<bits/stdc++.h>
When $ a \neq 0 $, we can find $$ x=\frac{-b\pm\sqrt{b^2-4ac}}{2a} $$ helloworld123456789 你好