【假博客】latex学习

https://www.cnblogs.com/laphi/p/6507613.html
假装会了
上下取整
$\lceil x \rceil$ $\lfloor x \rfloor$
\(\lceil x \rceil\) \(\lfloor x \rfloor\)
单行注释
\(a %c b\)

$a
%c
b$

多行注释
不会

\[\frac{1}{2} \]

\[\rm{shenwen20} \]

\[\bf{shenwen20} \]

\(\sf{shenwen20}\) \(\tt{shenwen20}\) \(\cal{shenwen20}\)
\(\it{shenwen20}\) \(\sl{shenwen20}\) \(\sc{shenwen20}\) \(\mit{shenwen20}\)
\(\text{a a a}\)
\(a a a\)

\[a\ a\ \ a da \]

\[\left( \sum_1^n\frac{1}{k} \right) \]

\[\left| \sum_1^n\frac{1}{k} \right| \]

\[\begin{matrix}1 & 2&555\\3 &4&6\end{matrix} \]

\[\prod_1^n \]

\[\prod_{i=1}^{n^2+log(m)+nlog(k)} \]

\[\underline{\prod_{i=1}^{n^2+log(m)+nlog(k)}} \]

\(\prod_1^n\)

\[\Pi_1^n \]

\[\lim_{x \to 0} \]

\(\mathbf{X} \qquad X\)
say, \(\lfloor x \rfloor\)
ehh?
what \(\lceil x \rceil\)

\[\sum\\ \prod \]

a line\( \sum\\\prod\\\sum \)ends

\[y = \left\{ \begin{array}{ll} a & \text{if $d>c$}\\ b+x & \textrm{in the morning}\\ l & \textrm{all day long} \end{array} \right. \]

\[y= \left\{ \begin{array} sb & (1)\\ big\ sb & (2)\\ huge\ sb \end{array} \right. \]

\[y= \left\{ \begin{array}{ll} sb & (1)\\ big\ sb & (2)\\ huge\ sb \end{array} \right. \]