Typora使用数学公式

https://www.cnblogs.com/lzp110119/p/17648271.html

https://www.zybuluo.com/codeep/note/163962#mjx-eqn-eqsample

https://www.cnblogs.com/Xuxiaokang/p/15654336.html#%E5%A6%82%E4%BD%95%E6%8F%92%E5%85%A5%E5%85%AC%E5%BC%8F