Phép toán nào sau đây không thực hiện được:

\[\left( {\begin{array}{*{20}{c}}\begin{array}{l}1\\5\end{array}&\begin{array}{l}2\\0\end{array}&\begin{array}{l} - 3\\7\end{array}&\begin{array}{l}6\\9\end{array}\end{array}} \right) + \left( {\begin{array}{*{20}{c}}\begin{array}{l} - 5\\ - 2\end{array}&\begin{array}{l}1\\8\end{array}&\begin{array}{l} - 3\\ - 4\end{array}&\begin{array}{l}0\\2\end{array}\end{array}} \right)\]

\[\left( {\begin{array}{*{20}{c}}\begin{array}{l}1\\3\end{array}&\begin{array}{l}2\\4\end{array}&\begin{array}{l}5\\7\end{array}\end{array}} \right) + \left( {\begin{array}{*{20}{c}}4&3\\2&9\end{array}} \right)\]

\[ - 3\left( {\begin{array}{*{20}{c}}\begin{array}{l}1\\5\end{array}&\begin{array}{l}2\\0\end{array}&\begin{array}{l} - 3\\7\end{array}&\begin{array}{l}6\\9\end{array}\end{array}} \right)\]

\[0\left( {\begin{array}{*{20}{c}}\begin{array}{l} - 5\\ - 2\end{array}&\begin{array}{l}1\\8\end{array}&\begin{array}{l} - 3\\ - 4\end{array}&\begin{array}{l}0\\2\end{array}\end{array}} \right)\]