设 $\alpha =\left[\begin{array}{l}1 \\ 2 \\ 3\end{array}\right], \beta =\left[\begin{array}{l}1 \\ 3 \\ 4\end{array}\right]$, 分别计算 $\alpha \beta ^{ T }, \beta \alpha ^{ T }, \alpha \alpha ^{ T }$ 及 $\beta ^{ T } \alpha , \alpha ^{ T } \beta , \alpha ^{ T } \alpha$.