並前往https://percent4.github.io/2020/06/09/%E7%94%A8Sympy%E8%AE%A1%E7%AE%97%E9%AB%98%E6%AC%A1%E6%96%B9%E7%A8%8B%E7%9A%84%E5%88%A4%E5%88%AB%E5%BC%8F/