$［\begin{array}{c}\mathrm{一个}\\ b\\ c\end{array}］＝［\begin{array}{ccc}1& 0& 1\\ -\frac{1}{2}& \frac{\sqrt{3.}}{2}& 1\\ -\frac{1}{2}& -\frac{\sqrt{3.}}{2}& 1\end{array}］［\begin{array}{c}\alpha \\ \beta \\ 0\end{array}］$

$［\begin{array}{c}\mathrm{一个}\\ b\\ c\end{array}］＝\sqrt{\frac{2}{3.}}［\begin{array}{ccc}1& 0& \frac{1}{\sqrt{2}}\\ -\frac{1}{2}& \frac{\sqrt{3.}}{2}& \frac{1}{\sqrt{2}}\\ -\frac{1}{2}& -\frac{\sqrt{3.}}{2}& \frac{1}{\sqrt{2}}\end{array}］［\begin{array}{c}\alpha \\ \beta \\ 0\end{array}］$