就是看下发不发🉐了～ ===
回复一下，看看～ ---
When \($a \ne 0$\), there are two solutions to \($ax^2 + bx + c = 0$\) and they are \[$x = {-b \pm \sqrt{b^2-4ac} \over 2a}.$\]
新增了MathJax支持！