参考:http://blog.sina.com.cn/s/blog_5e16f1770100nd48.html
\(
\begin{tabular}{lr}
&12\\
+&143\\
+&654\
+&24\\
\hline
=&\small$\square\!\square\!\square$
\end{tabular}
\)
然鹅报错:Unknown environment ‘tabular’
参考:http://blog.sina.com.cn/s/blog_5e16f1770100nd48.html
\(
\begin{tabular}{lr}
&12\\
+&143\\
+&654\
+&24\\
\hline
=&\small$\square\!\square\!\square$
\end{tabular}
\)
然鹅报错:Unknown environment ‘tabular’