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mathjax

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单行数学表达式:
$a \ne 0$

多行数学表达式:
$$
\begin{aligned}
a &= b + c \\
&= d + e + f + g \\
&= h + i
\end{aligned}
$$

i=0i2\sum_{i=0}^\infty i^2

\sum/\frac{采样项本期值}{采样项基期值} / {采样项个数}
(/)\sum(\frac{采样项本期值}{采样项基期值} / {采样项个数})
/\sum \frac{采样项本期值}{采样项基期值} / {采样项个数}

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