$$\frac{1}{\sqrt{2\mathrm{\pi .}}}\mathrm{exp.}\left\{-\frac{{（\sqrt{\raisebox{1ex}{$X$}\!\left/ \!\raisebox{-1ex}{$\beta $}\right.}-\sqrt{\raisebox{1ex}{$\beta $}\!\left/ \!\raisebox{-1ex}{$X$}\right.}的）}^2}{2{\mathrm{\gamma .}}^2}\right\}（\frac{（\sqrt{\raisebox{1ex}{$X$}\!\left/ \!\raisebox{-1ex}{$\beta $}\right.}+\sqrt{\raisebox{1ex}{$\beta $}\!\left/ \!\raisebox{-1ex}{$X$}\right.}的）}{2\mathrm{\gamma .}X}的）$$

$$\frac{（\sqrt{\raisebox{1ex}{$X$}\!\left/ \!\raisebox{-1ex}{$\beta $}\right.}-\sqrt{\raisebox{1ex}{$\beta $}\!\left/ \!\raisebox{-1ex}{$X$}\right.}的）}{\mathrm{\gamma .}}$$