$ a^2 $
$ 100 ~m ^{3}$
\(\lim_{n \to \infty} \sum_{k=1}^n \frac{1}{k^2} = \frac{\pi^2}{6}\)
\(C {}^{12}_{6}\)
$sum_
\(\phi\)
\(\mu\)
\(f[i][j] = max( f[i+1][j^2],f[i][j])\)
\(\frac {x^2} {z}\ \neq w\)
\(\frac {x^2} {z}\ = w\)
\(y'\)
\(\sum_{k}^n\)
原文：https://www.cnblogs.com/OIEREDSION/p/11336417.html