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

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