[tex] A= \left[\begin{array}{ccc}a_{11}&a_{12}&a_{13}\\a_{21}&a_{22}&a_{23}\end{array}\right] \\
\\
A= \left[\begin{array}{ccc}1+4.1&1+4.2&1+4.3}\\2+4.1&2+4.2&2+4.3\end{array}\right] \\
\\
A= \left[\begin{array}{ccc}5&9&13}\\6&10&14\end{array}\right] \\[/tex]
[tex] B= \left[\begin{array}{ccc}b_{11}&b_{12}&b_{13}\\b_{21}&b_{22}&b_{23}\\b_{31}&b_32}&b_{33}\end{array}\right] \\
\\
B= \left[\begin{array}{ccc}4.1.1&4.1.2&4.1.3\\4.2.1&4.2.2}&4.2.3\\4.3.1}&4.3.2&4.3.3\end{array}\right] \\
\\
B= \left[\begin{array}{ccc}4&8&12\\8&16}&24\\12}&24&36\end{array}\right] [/tex]
