色k

那就多打几个 & 咯

1. \begin{array}{ccc}
   
2. &A&B\\
   
3. +&C&D\\
   
4. \hline
   
5. =&I&I
   
6. \end{array}

复制代码

\begin{array}{ccc}
&A&B\\
+&C&D\\
\hline
=&I&I
\end{array}