どうして私のmarkdownの中の数学の公式はすべて崩れましたか???

目次

try a try

ac is ok

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https://www.diyifanwen.com/fanwen/dangyuanxindetihui/2665516.htm https://www.diyifanwen.com/fanwen/dangyuanxindetihui/2665516.htm https://www.diyifanwen.com/fanwen/dangkexindetihui/2661093.htm https://zhidao.baidu.com/question/585243762.html

try a try

$\sum_{d|n}\mu(d) = [n==1] $
$ x $
$\sum_{d|n}\phi(d) = n $
\[\sum_{d|n}\mu(d) = [n==1]\]
\[\begin{equation}\sum_{d|n}\phi(d) = n\end{equation}\]
\[\[\begin{aligned} x ={}& a+b+c+{}\\&d+e+f+g\end{aligned}\]\]

ac is ok

#include
int main() {
      std::cout << "Hello!
";
}

$\sum_{k=1}^{log_{4}^{N}}{\frac{3}{4^{k}}}Nk $
\[\begin{cases} 3x + 5y + z\\7x - 2y + 4z\\-6x + 3y + 2z\end{cases}\]
\[\begin{array}\overline{a+b+c}\\\underline{a+b+c}\\\overleftarrow{a+b}\\\underleftarrow{a+b}\\\underleftrightarrow{a+b}\\\vec x =\vec{AB}\\\overbrace {a+b}^\text{a,b}\\a+\rlap{\overbrace{\phantom{b+c+d}}^m}b+\underbrace{c+d+e}_n+f\end{array}\]
\[\begin{array}\sum_{d|n}\mu(d) = [n==1]\end{array}\]