个人笔记：

需要数学符号支持 $x^2+$$x \times 5$

When $(a \ne 0)$ , there are two solutions to $(ax^2 + bx + c = 0)$ and they are $$[x = {-b \pm \sqrt{b^2-4ac} \over 2a}.]$$ 加入如下代码：

<head>
<script>
MathJax = {
tex: {inlineMath: [['$', '$'], ['\\(', '\\)']]}
};
</script>
<script src="https://polyfill.io/v3/polyfill.min.js?features=es6"></script>
<script id="MathJax-script" async src="https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-mml-chtml.js"></script>
</head>

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