$$\mathrm{一个}\otimes 乙=\left[\begin{array}{ccc}\begin{array}{cc}{\mathrm{一个}}_{11}乙& {\mathrm{一个}}_{12}乙\end{array}& \cdots & {\mathrm{一个}}_{1ñ}乙\\ \begin{array}{cc}\begin{array}{c}{\mathrm{一个}}_{21}乙\\ ⋮\end{array}& \begin{array}{c}{\mathrm{一个}}_{22}乙\\ ⋮\end{array}\end{array}& \begin{array}{c}\cdots \\ \ddots \end{array}& \begin{array}{c}{\mathrm{一个}}_{2ñ}乙\\ ⋮\end{array}\\ \begin{array}{cc}{\mathrm{一个}}_{米1}乙& {\mathrm{一个}}_{米2}乙\end{array}& \cdots & {\mathrm{一个}}_{米ñ}乙\end{array}\right]。$$

$$\begin{array}{l}\mathrm{一个}=\left[\begin{array}{cc}1& -2\\ -1& 0\end{array}\right]，乙=\left[\begin{array}{cc}4& -3\\ 2& 3\end{array}\right]\\ \\ \mathrm{一个}\otimes 乙=\left[\begin{array}{cccc}1·4& 1·-3& -2·4& -2·-3\\ 1·2& 1·3& -2·2& -2·3\\ -1·4& -1·-3& 0·4& 0·-3\\ -1·2& -1·3& 0·2& 0·3\end{array}\right]=\left[\begin{array}{cccc}4& -3& -8& 6\\ 2& 3& -4& -6\\ -4& 3& 0& 0\\ -2& -3& 0& 0\end{array}\right]。\end{array}$$