$$\begin{array}{l}\mathrm{dgydF4y2Ba}{\mathrm{年代gydF4y2Ba}}_{\mathrm{tgydF4y2Ba}}＝gydF4y2Ba（gydF4y2Ba\mathrm{rgydF4y2Ba}-gydF4y2Ba\mathrm{问gydF4y2Ba}）gydF4y2Ba{\mathrm{年代gydF4y2Ba}}_{\mathrm{tgydF4y2Ba}}\mathrm{dgydF4y2Ba}\mathrm{tgydF4y2Ba}+gydF4y2Ba\sqrt{{\mathrm{vgydF4y2Ba}}_{\mathrm{tgydF4y2Ba}}}{\mathrm{年代gydF4y2Ba}}_{\mathrm{tgydF4y2Ba}}\mathrm{dgydF4y2Ba}{\mathrm{WgydF4y2Ba}}_{\mathrm{tgydF4y2Ba}}\\ \mathrm{dgydF4y2Ba}{\mathrm{vgydF4y2Ba}}_{\mathrm{tgydF4y2Ba}}＝gydF4y2Ba\mathrm{\kappa gydF4y2Ba}（gydF4y2Ba\mathrm{\theta gydF4y2Ba}-gydF4y2Ba{\mathrm{vgydF4y2Ba}}_{\mathrm{tgydF4y2Ba}}）gydF4y2Ba\mathrm{dgydF4y2Ba}\mathrm{tgydF4y2Ba}+gydF4y2Ba{\mathrm{\sigma gydF4y2Ba}}_{\mathrm{vgydF4y2Ba}}\sqrt{{\mathrm{vgydF4y2Ba}}_{\mathrm{tgydF4y2Ba}}}\mathrm{dgydF4y2Ba}{\mathrm{WgydF4y2Ba}}_{\mathrm{tgydF4y2Ba}}^{\mathrm{vgydF4y2Ba}}\\ \text{EgydF4y2Ba}［gydF4y2Ba\mathrm{dgydF4y2Ba}{\mathrm{WgydF4y2Ba}}_{\mathrm{tgydF4y2Ba}}\mathrm{dgydF4y2Ba}{\mathrm{WgydF4y2Ba}}_{\mathrm{tgydF4y2Ba}}^{\mathrm{vgydF4y2Ba}}］gydF4y2Ba＝gydF4y2Ba\mathrm{pgydF4y2Ba}\mathrm{dgydF4y2Ba}\mathrm{tgydF4y2Ba}\end{array}$$

$$\begin{array}{l}{\mathrm{fgydF4y2Ba}}_{\mathrm{HgydF4y2Ba}\mathrm{egydF4y2Ba}\mathrm{年代gydF4y2Ba}\mathrm{tgydF4y2Ba}\mathrm{ogydF4y2Ba}{\mathrm{ngydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}}（gydF4y2Ba\mathrm{\varphi gydF4y2Ba}）gydF4y2Ba＝gydF4y2Ba\mathrm{经验值gydF4y2Ba}（gydF4y2Ba{\mathrm{CgydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}+gydF4y2Ba{\mathrm{DgydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}{\mathrm{vgydF4y2Ba}}_{\mathrm{0gydF4y2Ba}}+gydF4y2Ba\mathrm{我gydF4y2Ba}\mathrm{\varphi gydF4y2Ba}\mathrm{lngydF4y2Ba}{\mathrm{年代gydF4y2Ba}}_{\mathrm{tgydF4y2Ba}}）gydF4y2Ba\\ {\mathrm{CgydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}＝gydF4y2Ba（gydF4y2Ba\mathrm{rgydF4y2Ba}-gydF4y2Ba\mathrm{问gydF4y2Ba}）gydF4y2Ba\mathrm{我gydF4y2Ba}\mathrm{\varphi gydF4y2Ba}\mathrm{\tau gydF4y2Ba}+gydF4y2Ba\frac{\mathrm{\kappa gydF4y2Ba}\mathrm{\theta gydF4y2Ba}}{{\mathrm{\sigma gydF4y2Ba}}_{\mathrm{vgydF4y2Ba}}^{\mathrm{2gydF4y2Ba}}}［gydF4y2Ba（gydF4y2Ba{\mathrm{bgydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}-gydF4y2Ba\mathrm{pgydF4y2Ba}{\mathrm{\sigma gydF4y2Ba}}_{\mathrm{vgydF4y2Ba}}\mathrm{我gydF4y2Ba}\mathrm{\varphi gydF4y2Ba}+gydF4y2Ba{\mathrm{dgydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}）gydF4y2Ba\mathrm{\tau gydF4y2Ba}-gydF4y2Ba\mathrm{2gydF4y2Ba}\mathrm{lngydF4y2Ba}（gydF4y2Ba\frac{\mathrm{1gydF4y2Ba}-gydF4y2Ba{\mathrm{ggydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}{\mathrm{egydF4y2Ba}}^{{\mathrm{dgydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}\mathrm{\tau gydF4y2Ba}}}{\mathrm{1gydF4y2Ba}-gydF4y2Ba{\mathrm{ggydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}}）gydF4y2Ba］gydF4y2Ba\\ {\mathrm{DgydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}＝gydF4y2Ba\frac{{\mathrm{bgydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}-gydF4y2Ba\mathrm{pgydF4y2Ba}{\mathrm{\sigma gydF4y2Ba}}_{\mathrm{vgydF4y2Ba}}\mathrm{我gydF4y2Ba}\mathrm{\varphi gydF4y2Ba}+gydF4y2Ba{\mathrm{dgydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}}{{\mathrm{\sigma gydF4y2Ba}}_{\mathrm{vgydF4y2Ba}}^{\mathrm{2gydF4y2Ba}}}（gydF4y2Ba\frac{\mathrm{1gydF4y2Ba}-gydF4y2Ba{\mathrm{egydF4y2Ba}}^{{\mathrm{dgydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}\mathrm{\tau gydF4y2Ba}}}{\mathrm{1gydF4y2Ba}-gydF4y2Ba{\mathrm{ggydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}{\mathrm{egydF4y2Ba}}^{{\mathrm{dgydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}\mathrm{\tau gydF4y2Ba}}}）gydF4y2Ba\\ {\mathrm{ggydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}＝gydF4y2Ba\frac{{\mathrm{bgydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}-gydF4y2Ba\mathrm{pgydF4y2Ba}{\mathrm{\sigma gydF4y2Ba}}_{\mathrm{vgydF4y2Ba}}\mathrm{我gydF4y2Ba}\mathrm{\varphi gydF4y2Ba}+gydF4y2Ba{\mathrm{dgydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}}{{\mathrm{bgydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}-gydF4y2Ba\mathrm{pgydF4y2Ba}{\mathrm{\sigma gydF4y2Ba}}_{\mathrm{vgydF4y2Ba}}\mathrm{我gydF4y2Ba}\mathrm{\varphi gydF4y2Ba}-gydF4y2Ba{\mathrm{dgydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}}\\ {\mathrm{dgydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}＝gydF4y2Ba\sqrt{{（gydF4y2Ba{\mathrm{bgydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}-gydF4y2Ba\mathrm{pgydF4y2Ba}{\mathrm{\sigma gydF4y2Ba}}_{\mathrm{vgydF4y2Ba}}\mathrm{我gydF4y2Ba}\mathrm{\varphi gydF4y2Ba}）gydF4y2Ba}^{\mathrm{2gydF4y2Ba}}-gydF4y2Ba{\mathrm{\sigma gydF4y2Ba}}_{\mathrm{vgydF4y2Ba}}^{\mathrm{2gydF4y2Ba}}（gydF4y2Ba\mathrm{2gydF4y2Ba}{\mathrm{ugydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}\mathrm{我gydF4y2Ba}\mathrm{\varphi gydF4y2Ba}-gydF4y2Ba{\mathrm{\varphi gydF4y2Ba}}^{\mathrm{2gydF4y2Ba}}）gydF4y2Ba}\\ \text{在gydF4y2Ba}\mathrm{jgydF4y2Ba}＝gydF4y2Ba\mathrm{1gydF4y2Ba}，gydF4y2Ba\mathrm{2gydF4y2Ba}：gydF4y2Ba\\ {\mathrm{ugydF4y2Ba}}_{\mathrm{1gydF4y2Ba}}＝gydF4y2Ba\frac{\mathrm{1gydF4y2Ba}}{\mathrm{2gydF4y2Ba}}，gydF4y2Ba{\mathrm{ugydF4y2Ba}}_{\mathrm{2gydF4y2Ba}}＝gydF4y2Ba-gydF4y2Ba\frac{\mathrm{1gydF4y2Ba}}{\mathrm{2gydF4y2Ba}}，gydF4y2Ba{\mathrm{bgydF4y2Ba}}_{\mathrm{1gydF4y2Ba}}＝gydF4y2Ba\mathrm{\kappa gydF4y2Ba}+gydF4y2Ba{\mathrm{\lambda gydF4y2Ba}}_{\mathrm{VgydF4y2Ba}\mathrm{ogydF4y2Ba}\mathrm{lgydF4y2Ba}\mathrm{RgydF4y2Ba}\mathrm{我gydF4y2Ba}\mathrm{年代gydF4y2Ba}\mathrm{kgydF4y2Ba}}-gydF4y2Ba\mathrm{pgydF4y2Ba}{\mathrm{\sigma gydF4y2Ba}}_{\mathrm{vgydF4y2Ba}}，gydF4y2Ba{\mathrm{bgydF4y2Ba}}_{\mathrm{2gydF4y2Ba}}＝gydF4y2Ba\mathrm{\kappa gydF4y2Ba}+gydF4y2Ba{\mathrm{\lambda gydF4y2Ba}}_{\mathrm{VgydF4y2Ba}\mathrm{ogydF4y2Ba}\mathrm{lgydF4y2Ba}\mathrm{RgydF4y2Ba}\mathrm{我gydF4y2Ba}\mathrm{年代gydF4y2Ba}\mathrm{kgydF4y2Ba}}\end{array}$$

$$\begin{array}{l}{\mathrm{CgydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}＝gydF4y2Ba（gydF4y2Ba\mathrm{rgydF4y2Ba}-gydF4y2Ba\mathrm{问gydF4y2Ba}）gydF4y2Ba\mathrm{我gydF4y2Ba}\mathrm{\varphi gydF4y2Ba}\mathrm{\tau gydF4y2Ba}+gydF4y2Ba\frac{\mathrm{\kappa gydF4y2Ba}\mathrm{\theta gydF4y2Ba}}{{\mathrm{\sigma gydF4y2Ba}}_{\mathrm{vgydF4y2Ba}}{}^{\mathrm{2gydF4y2Ba}}}［gydF4y2Ba（gydF4y2Ba{\mathrm{bgydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}-gydF4y2Ba\mathrm{pgydF4y2Ba}{\mathrm{\sigma gydF4y2Ba}}_{\mathrm{vgydF4y2Ba}}\mathrm{我gydF4y2Ba}\mathrm{\varphi gydF4y2Ba}-gydF4y2Ba{\mathrm{dgydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}）gydF4y2Ba\mathrm{\tau gydF4y2Ba}-gydF4y2Ba\mathrm{2gydF4y2Ba}\mathrm{lngydF4y2Ba}（gydF4y2Ba\frac{\mathrm{1gydF4y2Ba}-gydF4y2Ba{\mathrm{\epsilon gydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}{\mathrm{egydF4y2Ba}}^{-gydF4y2Ba{\mathrm{dgydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}\mathrm{\tau gydF4y2Ba}}}{\mathrm{1gydF4y2Ba}-gydF4y2Ba{\mathrm{\epsilon gydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}}）gydF4y2Ba］gydF4y2Ba\\ \mathrm{DgydF4y2Ba}\mathrm{jgydF4y2Ba}＝gydF4y2Ba\frac{{\mathrm{bgydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}-gydF4y2Ba\mathrm{pgydF4y2Ba}{\mathrm{\sigma gydF4y2Ba}}_{\mathrm{vgydF4y2Ba}}\mathrm{我gydF4y2Ba}\mathrm{\varphi gydF4y2Ba}-gydF4y2Ba{\mathrm{dgydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}}{{\mathrm{\sigma gydF4y2Ba}}_{\mathrm{vgydF4y2Ba}}^{\mathrm{2gydF4y2Ba}}}（gydF4y2Ba\frac{\mathrm{1gydF4y2Ba}-gydF4y2Ba{\mathrm{egydF4y2Ba}}^{-gydF4y2Ba{\mathrm{dgydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}\mathrm{\tau gydF4y2Ba}}}{\mathrm{1gydF4y2Ba}-gydF4y2Ba{\mathrm{\epsilon gydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}{\mathrm{egydF4y2Ba}}^{-gydF4y2Ba{\mathrm{dgydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}\mathrm{\tau gydF4y2Ba}}}）gydF4y2Ba\\ {\mathrm{\epsilon gydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}＝gydF4y2Ba\frac{{\mathrm{bgydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}-gydF4y2Ba\mathrm{pgydF4y2Ba}{\mathrm{\sigma gydF4y2Ba}}_{\mathrm{vgydF4y2Ba}}\mathrm{我gydF4y2Ba}\mathrm{\varphi gydF4y2Ba}-gydF4y2Ba{\mathrm{dgydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}}{{\mathrm{bgydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}-gydF4y2Ba\mathrm{pgydF4y2Ba}{\mathrm{\sigma gydF4y2Ba}}_{\mathrm{vgydF4y2Ba}}\mathrm{我gydF4y2Ba}\mathrm{\varphi gydF4y2Ba}+gydF4y2Ba{\mathrm{dgydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}}\end{array}$$

$$\begin{array}{l}\mathrm{dgydF4y2Ba}{\mathrm{年代gydF4y2Ba}}_{\mathrm{tgydF4y2Ba}}＝gydF4y2Ba（gydF4y2Ba\mathrm{rgydF4y2Ba}-gydF4y2Ba\mathrm{问gydF4y2Ba}-gydF4y2Ba{\mathrm{\lambda gydF4y2Ba}}_{\mathrm{pgydF4y2Ba}}{\mathrm{\mu gydF4y2Ba}}_{\mathrm{JgydF4y2Ba}}）gydF4y2Ba{\mathrm{年代gydF4y2Ba}}_{\mathrm{tgydF4y2Ba}}\mathrm{dgydF4y2Ba}\mathrm{tgydF4y2Ba}+gydF4y2Ba\sqrt{{\mathrm{vgydF4y2Ba}}_{\mathrm{tgydF4y2Ba}}}{\mathrm{年代gydF4y2Ba}}_{\mathrm{tgydF4y2Ba}}\mathrm{dgydF4y2Ba}{\mathrm{WgydF4y2Ba}}_{\mathrm{tgydF4y2Ba}}+gydF4y2Ba\mathrm{JgydF4y2Ba}{\mathrm{年代gydF4y2Ba}}_{\mathrm{tgydF4y2Ba}}\mathrm{dgydF4y2Ba}{\mathrm{PgydF4y2Ba}}_{\mathrm{tgydF4y2Ba}}\\ \mathrm{dgydF4y2Ba}{\mathrm{vgydF4y2Ba}}_{\mathrm{tgydF4y2Ba}}＝gydF4y2Ba\mathrm{\kappa gydF4y2Ba}（gydF4y2Ba\mathrm{\theta gydF4y2Ba}-gydF4y2Ba{\mathrm{vgydF4y2Ba}}_{\mathrm{tgydF4y2Ba}}）gydF4y2Ba\mathrm{dgydF4y2Ba}\mathrm{tgydF4y2Ba}+gydF4y2Ba{\mathrm{\sigma gydF4y2Ba}}_{\mathrm{vgydF4y2Ba}}\sqrt{{\mathrm{vgydF4y2Ba}}_{\mathrm{tgydF4y2Ba}}}\mathrm{dgydF4y2Ba}{\mathrm{WgydF4y2Ba}}_{\mathrm{tgydF4y2Ba}}\\ \text{EgydF4y2Ba}［gydF4y2Ba\mathrm{dgydF4y2Ba}{\mathrm{WgydF4y2Ba}}_{\mathrm{tgydF4y2Ba}}\mathrm{dgydF4y2Ba}{\mathrm{WgydF4y2Ba}}_{\mathrm{tgydF4y2Ba}}^{\mathrm{vgydF4y2Ba}}］gydF4y2Ba＝gydF4y2Ba\mathrm{pgydF4y2Ba}\mathrm{dgydF4y2Ba}\mathrm{tgydF4y2Ba}\\ \text{概率(gydF4y2Ba}\mathrm{dgydF4y2Ba}{\mathrm{PgydF4y2Ba}}_{\mathrm{tgydF4y2Ba}}＝gydF4y2Ba\mathrm{1gydF4y2Ba}）gydF4y2Ba＝gydF4y2Ba{\mathrm{\lambda gydF4y2Ba}}_{\mathrm{pgydF4y2Ba}}\mathrm{dgydF4y2Ba}\mathrm{tgydF4y2Ba}\end{array}$$

$$\frac{\mathrm{1gydF4y2Ba}}{（gydF4y2Ba\mathrm{1gydF4y2Ba}+gydF4y2Ba\mathrm{JgydF4y2Ba}）gydF4y2Ba\mathrm{\delta gydF4y2Ba}\sqrt{\mathrm{2gydF4y2Ba}\mathrm{\pi gydF4y2Ba}}}\mathrm{经验值gydF4y2Ba}｛gydF4y2Ba{\frac{-gydF4y2Ba［gydF4y2Ba\mathrm{lngydF4y2Ba}（gydF4y2Ba\mathrm{1gydF4y2Ba}+gydF4y2Ba\mathrm{JgydF4y2Ba}）gydF4y2Ba-gydF4y2Ba（gydF4y2Ba\mathrm{lngydF4y2Ba}（gydF4y2Ba\mathrm{1gydF4y2Ba}+gydF4y2Ba{\mathrm{\mu gydF4y2Ba}}_{\mathrm{JgydF4y2Ba}}）gydF4y2Ba-gydF4y2Ba\frac{{\mathrm{\delta gydF4y2Ba}}^{\mathrm{2gydF4y2Ba}}}{\mathrm{2gydF4y2Ba}}］gydF4y2Ba}{\mathrm{2gydF4y2Ba}{\mathrm{\delta gydF4y2Ba}}^{\mathrm{2gydF4y2Ba}}}}^{\mathrm{2gydF4y2Ba}}｝gydF4y2Ba$$

$$\begin{array}{l}{\mathrm{fgydF4y2Ba}}_{\mathrm{BgydF4y2Ba}\mathrm{一个gydF4y2Ba}\mathrm{tgydF4y2Ba}\mathrm{egydF4y2Ba}\mathrm{年代gydF4y2Ba}（gydF4y2Ba\mathrm{\varphi gydF4y2Ba}）gydF4y2Ba}＝gydF4y2Ba\mathrm{经验值gydF4y2Ba}（gydF4y2Ba{\mathrm{CgydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}+gydF4y2Ba{\mathrm{DgydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}{\mathrm{vgydF4y2Ba}}_{\mathrm{0gydF4y2Ba}}+gydF4y2Ba\mathrm{我gydF4y2Ba}\mathrm{\varphi gydF4y2Ba}\mathrm{lngydF4y2Ba}{\mathrm{年代gydF4y2Ba}}_{\mathrm{tgydF4y2Ba}}）gydF4y2Ba\mathrm{经验值gydF4y2Ba}{（gydF4y2Ba{\mathrm{\lambda gydF4y2Ba}}_{\mathrm{pgydF4y2Ba}}\mathrm{\tau gydF4y2Ba}（gydF4y2Ba\mathrm{1gydF4y2Ba}+gydF4y2Ba{\mathrm{\mu gydF4y2Ba}}_{\mathrm{JgydF4y2Ba}}）gydF4y2Ba}^{{\mathrm{米gydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}+gydF4y2Ba\frac{\mathrm{1gydF4y2Ba}}{\mathrm{2gydF4y2Ba}}}［gydF4y2Ba{（gydF4y2Ba\mathrm{1gydF4y2Ba}+gydF4y2Ba{\mathrm{\mu gydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}）gydF4y2Ba}^{\mathrm{我gydF4y2Ba}\mathrm{\varphi gydF4y2Ba}}{\mathrm{egydF4y2Ba}}^{{\mathrm{\delta gydF4y2Ba}}^{\mathrm{2gydF4y2Ba}}（gydF4y2Ba{\mathrm{米gydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}\mathrm{我gydF4y2Ba}\mathrm{\varphi gydF4y2Ba}+gydF4y2Ba\frac{{（gydF4y2Ba\mathrm{我gydF4y2Ba}\mathrm{\varphi gydF4y2Ba}）gydF4y2Ba}^{\mathrm{2gydF4y2Ba}}}{\mathrm{2gydF4y2Ba}}）gydF4y2Ba}-gydF4y2Ba\mathrm{1gydF4y2Ba}］gydF4y2Ba-gydF4y2Ba{\mathrm{\lambda gydF4y2Ba}}_{\mathrm{pgydF4y2Ba}}\mathrm{\tau gydF4y2Ba}{\mathrm{\mu gydF4y2Ba}}_{\mathrm{JgydF4y2Ba}}\mathrm{我gydF4y2Ba}\mathrm{\varphi gydF4y2Ba}）gydF4y2Ba\\ {\mathrm{米gydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}＝gydF4y2Ba｛gydF4y2Ba\begin{array}{l}{\mathrm{米gydF4y2Ba}}_{\mathrm{1gydF4y2Ba}}＝gydF4y2Ba\frac{\mathrm{1gydF4y2Ba}}{\mathrm{2gydF4y2Ba}}\\ {\mathrm{米gydF4y2Ba}}_{\mathrm{2gydF4y2Ba}}＝gydF4y2Ba-gydF4y2Ba\frac{\mathrm{1gydF4y2Ba}}{\mathrm{2gydF4y2Ba}}\end{array}｝gydF4y2Ba\\ {\mathrm{CgydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}＝gydF4y2Ba（gydF4y2Ba\mathrm{rgydF4y2Ba}-gydF4y2Ba\mathrm{问gydF4y2Ba}）gydF4y2Ba\mathrm{我gydF4y2Ba}\mathrm{\varphi gydF4y2Ba}\mathrm{\tau gydF4y2Ba}+gydF4y2Ba\frac{\mathrm{\kappa gydF4y2Ba}\mathrm{\theta gydF4y2Ba}}{{\mathrm{\sigma gydF4y2Ba}}_{\mathrm{vgydF4y2Ba}}{}^{\mathrm{2gydF4y2Ba}}}［gydF4y2Ba（gydF4y2Ba{\mathrm{bgydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}-gydF4y2Ba\mathrm{pgydF4y2Ba}{\mathrm{\sigma gydF4y2Ba}}_{\mathrm{vgydF4y2Ba}}\mathrm{我gydF4y2Ba}\mathrm{\varphi gydF4y2Ba}+gydF4y2Ba{\mathrm{dgydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}）gydF4y2Ba\mathrm{\tau gydF4y2Ba}-gydF4y2Ba\mathrm{2gydF4y2Ba}\mathrm{lngydF4y2Ba}（gydF4y2Ba\frac{\mathrm{1gydF4y2Ba}-gydF4y2Ba{\mathrm{ggydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}{\mathrm{egydF4y2Ba}}^{{\mathrm{dgydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}\mathrm{\tau gydF4y2Ba}}}{\mathrm{1gydF4y2Ba}-gydF4y2Ba{\mathrm{ggydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}}）gydF4y2Ba］gydF4y2Ba\\ \mathrm{DgydF4y2Ba}\mathrm{jgydF4y2Ba}＝gydF4y2Ba\frac{{\mathrm{bgydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}-gydF4y2Ba\mathrm{pgydF4y2Ba}{\mathrm{\sigma gydF4y2Ba}}_{\mathrm{vgydF4y2Ba}}\mathrm{我gydF4y2Ba}\mathrm{\varphi gydF4y2Ba}+gydF4y2Ba{\mathrm{dgydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}}{{\mathrm{\sigma gydF4y2Ba}}_{\mathrm{vgydF4y2Ba}}^{\mathrm{2gydF4y2Ba}}}（gydF4y2Ba\frac{\mathrm{1gydF4y2Ba}-gydF4y2Ba{\mathrm{egydF4y2Ba}}^{{\mathrm{dgydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}\mathrm{\tau gydF4y2Ba}}}{\mathrm{1gydF4y2Ba}-gydF4y2Ba{\mathrm{ggydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}{\mathrm{egydF4y2Ba}}^{{\mathrm{dgydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}\mathrm{\tau gydF4y2Ba}}}）gydF4y2Ba\\ {\mathrm{ggydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}＝gydF4y2Ba\frac{{\mathrm{bgydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}-gydF4y2Ba\mathrm{pgydF4y2Ba}{\mathrm{\sigma gydF4y2Ba}}_{\mathrm{vgydF4y2Ba}}\mathrm{我gydF4y2Ba}\mathrm{\varphi gydF4y2Ba}+gydF4y2Ba{\mathrm{dgydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}}{{\mathrm{bgydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}-gydF4y2Ba\mathrm{pgydF4y2Ba}{\mathrm{\sigma gydF4y2Ba}}_{\mathrm{vgydF4y2Ba}}\mathrm{我gydF4y2Ba}\mathrm{\varphi gydF4y2Ba}-gydF4y2Ba{\mathrm{dgydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}}\\ {\mathrm{dgydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}＝gydF4y2Ba\sqrt{{（gydF4y2Ba{\mathrm{bgydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}-gydF4y2Ba\mathrm{pgydF4y2Ba}{\mathrm{\sigma gydF4y2Ba}}_{\mathrm{vgydF4y2Ba}}\mathrm{我gydF4y2Ba}\mathrm{\varphi gydF4y2Ba}）gydF4y2Ba}^{\mathrm{2gydF4y2Ba}}-gydF4y2Ba{\mathrm{\sigma gydF4y2Ba}}_{\mathrm{vgydF4y2Ba}}^{\mathrm{2gydF4y2Ba}}（gydF4y2Ba\mathrm{2gydF4y2Ba}{\mathrm{ugydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}\mathrm{我gydF4y2Ba}\mathrm{\varphi gydF4y2Ba}-gydF4y2Ba{\mathrm{\varphi gydF4y2Ba}}^{\mathrm{2gydF4y2Ba}}）gydF4y2Ba}\\ \text{在gydF4y2Ba}\mathrm{jgydF4y2Ba}＝gydF4y2Ba\mathrm{1gydF4y2Ba}，gydF4y2Ba\mathrm{2gydF4y2Ba}：gydF4y2Ba\\ {\mathrm{ugydF4y2Ba}}_{\mathrm{1gydF4y2Ba}}＝gydF4y2Ba\frac{\mathrm{1gydF4y2Ba}}{\mathrm{2gydF4y2Ba}}，gydF4y2Ba{\mathrm{ugydF4y2Ba}}_{\mathrm{2gydF4y2Ba}}＝gydF4y2Ba-gydF4y2Ba\frac{\mathrm{1gydF4y2Ba}}{\mathrm{2gydF4y2Ba}}，gydF4y2Ba{\mathrm{bgydF4y2Ba}}_{\mathrm{1gydF4y2Ba}}＝gydF4y2Ba\mathrm{\kappa gydF4y2Ba}+gydF4y2Ba{\mathrm{\lambda gydF4y2Ba}}_{\mathrm{VgydF4y2Ba}\mathrm{ogydF4y2Ba}\mathrm{lgydF4y2Ba}\mathrm{RgydF4y2Ba}\mathrm{我gydF4y2Ba}\mathrm{年代gydF4y2Ba}\mathrm{kgydF4y2Ba}}-gydF4y2Ba\mathrm{pgydF4y2Ba}{\mathrm{\sigma gydF4y2Ba}}_{\mathrm{vgydF4y2Ba}}，gydF4y2Ba{\mathrm{bgydF4y2Ba}}_{\mathrm{2gydF4y2Ba}}＝gydF4y2Ba\mathrm{\kappa gydF4y2Ba}+gydF4y2Ba{\mathrm{\lambda gydF4y2Ba}}_{\mathrm{VgydF4y2Ba}\mathrm{ogydF4y2Ba}\mathrm{lgydF4y2Ba}\mathrm{RgydF4y2Ba}\mathrm{我gydF4y2Ba}\mathrm{年代gydF4y2Ba}\mathrm{kgydF4y2Ba}}\end{array}$$

$$\begin{array}{l}{\mathrm{CgydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}＝gydF4y2Ba（gydF4y2Ba\mathrm{rgydF4y2Ba}-gydF4y2Ba\mathrm{问gydF4y2Ba}）gydF4y2Ba\mathrm{我gydF4y2Ba}\mathrm{\varphi gydF4y2Ba}\mathrm{\tau gydF4y2Ba}+gydF4y2Ba\frac{\mathrm{\kappa gydF4y2Ba}\mathrm{\theta gydF4y2Ba}}{{\mathrm{\sigma gydF4y2Ba}}_{\mathrm{vgydF4y2Ba}}{}^{\mathrm{2gydF4y2Ba}}}［gydF4y2Ba（gydF4y2Ba{\mathrm{bgydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}-gydF4y2Ba\mathrm{pgydF4y2Ba}{\mathrm{\sigma gydF4y2Ba}}_{\mathrm{vgydF4y2Ba}}\mathrm{我gydF4y2Ba}\mathrm{\varphi gydF4y2Ba}-gydF4y2Ba{\mathrm{dgydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}）gydF4y2Ba\mathrm{\tau gydF4y2Ba}-gydF4y2Ba\mathrm{2gydF4y2Ba}\mathrm{lngydF4y2Ba}（gydF4y2Ba\frac{\mathrm{1gydF4y2Ba}-gydF4y2Ba{\mathrm{\epsilon gydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}{\mathrm{egydF4y2Ba}}^{-gydF4y2Ba{\mathrm{dgydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}\mathrm{\tau gydF4y2Ba}}}{\mathrm{1gydF4y2Ba}-gydF4y2Ba{\mathrm{\epsilon gydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}}）gydF4y2Ba］gydF4y2Ba\\ \mathrm{DgydF4y2Ba}\mathrm{jgydF4y2Ba}＝gydF4y2Ba\frac{{\mathrm{bgydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}-gydF4y2Ba\mathrm{pgydF4y2Ba}{\mathrm{\sigma gydF4y2Ba}}_{\mathrm{vgydF4y2Ba}}\mathrm{我gydF4y2Ba}\mathrm{\varphi gydF4y2Ba}-gydF4y2Ba{\mathrm{dgydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}}{{\mathrm{\sigma gydF4y2Ba}}_{\mathrm{vgydF4y2Ba}}^{\mathrm{2gydF4y2Ba}}}（gydF4y2Ba\frac{\mathrm{1gydF4y2Ba}-gydF4y2Ba{\mathrm{egydF4y2Ba}}^{-gydF4y2Ba{\mathrm{dgydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}\mathrm{\tau gydF4y2Ba}}}{\mathrm{1gydF4y2Ba}-gydF4y2Ba{\mathrm{\epsilon gydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}{\mathrm{egydF4y2Ba}}^{-gydF4y2Ba{\mathrm{dgydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}\mathrm{\tau gydF4y2Ba}}}）gydF4y2Ba\\ {\mathrm{\epsilon gydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}＝gydF4y2Ba\frac{{\mathrm{bgydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}-gydF4y2Ba\mathrm{pgydF4y2Ba}{\mathrm{\sigma gydF4y2Ba}}_{\mathrm{vgydF4y2Ba}}\mathrm{我gydF4y2Ba}\mathrm{\varphi gydF4y2Ba}-gydF4y2Ba{\mathrm{dgydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}}{{\mathrm{bgydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}-gydF4y2Ba\mathrm{pgydF4y2Ba}{\mathrm{\sigma gydF4y2Ba}}_{\mathrm{vgydF4y2Ba}}\mathrm{我gydF4y2Ba}\mathrm{\varphi gydF4y2Ba}+gydF4y2Ba{\mathrm{dgydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}}\end{array}$$

$$\begin{array}{l}\mathrm{dgydF4y2Ba}{\mathrm{年代gydF4y2Ba}}_{\mathrm{tgydF4y2Ba}}＝gydF4y2Ba（gydF4y2Ba\mathrm{rgydF4y2Ba}-gydF4y2Ba\mathrm{问gydF4y2Ba}-gydF4y2Ba{\mathrm{\lambda gydF4y2Ba}}_{\mathrm{pgydF4y2Ba}}{\mathrm{\mu gydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}）gydF4y2Ba{\mathrm{年代gydF4y2Ba}}_{\mathrm{tgydF4y2Ba}}\mathrm{dgydF4y2Ba}\mathrm{tgydF4y2Ba}+gydF4y2Ba\mathrm{\sigma gydF4y2Ba}{\mathrm{年代gydF4y2Ba}}_{\mathrm{tgydF4y2Ba}}\mathrm{dgydF4y2Ba}{\mathrm{WgydF4y2Ba}}_{\mathrm{tgydF4y2Ba}}+gydF4y2Ba\mathrm{JgydF4y2Ba}{\mathrm{年代gydF4y2Ba}}_{\mathrm{tgydF4y2Ba}}\mathrm{dgydF4y2Ba}{\mathrm{PgydF4y2Ba}}_{\mathrm{tgydF4y2Ba}}\\ \text{概率(gydF4y2Ba}\mathrm{dgydF4y2Ba}{\mathrm{PgydF4y2Ba}}_{\mathrm{tgydF4y2Ba}}＝gydF4y2Ba\mathrm{1gydF4y2Ba}）gydF4y2Ba＝gydF4y2Ba{\mathrm{\lambda gydF4y2Ba}}_{\mathrm{pgydF4y2Ba}}\mathrm{dgydF4y2Ba}\mathrm{tgydF4y2Ba}\end{array}$$

$$\frac{\mathrm{1gydF4y2Ba}}{（gydF4y2Ba\mathrm{1gydF4y2Ba}+gydF4y2Ba\mathrm{JgydF4y2Ba}）gydF4y2Ba\mathrm{\delta gydF4y2Ba}\sqrt{\mathrm{2gydF4y2Ba}\mathrm{\pi gydF4y2Ba}}}\mathrm{经验值gydF4y2Ba}｛gydF4y2Ba{\frac{-gydF4y2Ba［gydF4y2Ba\mathrm{lngydF4y2Ba}（gydF4y2Ba\mathrm{1gydF4y2Ba}+gydF4y2Ba\mathrm{JgydF4y2Ba}）gydF4y2Ba-gydF4y2Ba（gydF4y2Ba\mathrm{lngydF4y2Ba}（gydF4y2Ba\mathrm{1gydF4y2Ba}+gydF4y2Ba{\mathrm{\mu gydF4y2Ba}}_{\mathrm{JgydF4y2Ba}}）gydF4y2Ba-gydF4y2Ba\frac{{\mathrm{\delta gydF4y2Ba}}^{\mathrm{2gydF4y2Ba}}}{\mathrm{2gydF4y2Ba}}］gydF4y2Ba}{\mathrm{2gydF4y2Ba}{\mathrm{\delta gydF4y2Ba}}^{\mathrm{2gydF4y2Ba}}}}^{\mathrm{2gydF4y2Ba}}｝gydF4y2Ba$$

$$\begin{array}{l}{\mathrm{fgydF4y2Ba}}_{\mathrm{米gydF4y2Ba}\mathrm{egydF4y2Ba}\mathrm{rgydF4y2Ba}\mathrm{tgydF4y2Ba}\mathrm{ogydF4y2Ba}\mathrm{ngydF4y2Ba}{\mathrm{76gydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}}＝gydF4y2Ba{\mathrm{fgydF4y2Ba}}_{\mathrm{BgydF4y2Ba}{\mathrm{年代gydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}}\mathrm{经验值gydF4y2Ba}（gydF4y2Ba{\mathrm{\lambda gydF4y2Ba}}_{\mathrm{pgydF4y2Ba}}\mathrm{\tau gydF4y2Ba}{（gydF4y2Ba\mathrm{1gydF4y2Ba}+gydF4y2Ba{\mathrm{\mu gydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}）gydF4y2Ba}^{{\mathrm{米gydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}+gydF4y2Ba\frac{\mathrm{1gydF4y2Ba}}{\mathrm{2gydF4y2Ba}}}［gydF4y2Ba{（gydF4y2Ba\mathrm{1gydF4y2Ba}+gydF4y2Ba{\mathrm{\mu gydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}）gydF4y2Ba}^{\mathrm{我gydF4y2Ba}\mathrm{\varphi gydF4y2Ba}}{\mathrm{egydF4y2Ba}}^{{\mathrm{\delta gydF4y2Ba}}^{\mathrm{2gydF4y2Ba}}（gydF4y2Ba{\mathrm{米gydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}\mathrm{我gydF4y2Ba}\mathrm{\varphi gydF4y2Ba}+gydF4y2Ba\frac{{（gydF4y2Ba\mathrm{我gydF4y2Ba}\mathrm{\varphi gydF4y2Ba}）gydF4y2Ba}^{\mathrm{2gydF4y2Ba}}}{\mathrm{2gydF4y2Ba}}）gydF4y2Ba}-gydF4y2Ba\mathrm{1gydF4y2Ba}］gydF4y2Ba-gydF4y2Ba{\mathrm{\lambda gydF4y2Ba}}_{\mathrm{pgydF4y2Ba}}\mathrm{\tau gydF4y2Ba}{\mathrm{\mu gydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}\mathrm{我gydF4y2Ba}\mathrm{\varphi gydF4y2Ba}）gydF4y2Ba\\ \text{在gydF4y2Ba}\mathrm{jgydF4y2Ba}＝gydF4y2Ba\mathrm{1gydF4y2Ba}，gydF4y2Ba\mathrm{2gydF4y2Ba}：gydF4y2Ba\\ {\mathrm{fgydF4y2Ba}}_{\mathrm{BgydF4y2Ba}{\mathrm{年代gydF4y2Ba}}_{\mathrm{1gydF4y2Ba}}}（gydF4y2Ba\mathrm{\varphi gydF4y2Ba}）gydF4y2Ba＝gydF4y2Ba\frac{{\mathrm{fgydF4y2Ba}}_{\mathrm{BgydF4y2Ba}{\mathrm{年代gydF4y2Ba}}_{\mathrm{2gydF4y2Ba}}}（gydF4y2Ba\mathrm{\varphi gydF4y2Ba}-gydF4y2Ba\mathrm{我gydF4y2Ba}）gydF4y2Ba}{{\mathrm{fgydF4y2Ba}}_{\mathrm{BgydF4y2Ba}{\mathrm{年代gydF4y2Ba}}_{\mathrm{2gydF4y2Ba}}}（gydF4y2Ba-gydF4y2Ba\mathrm{我gydF4y2Ba}）gydF4y2Ba}\\ {\mathrm{fgydF4y2Ba}}_{\mathrm{BgydF4y2Ba}\mathrm{年代gydF4y2Ba}\mathrm{2gydF4y2Ba}}（gydF4y2Ba\mathrm{\varphi gydF4y2Ba}）gydF4y2Ba＝gydF4y2Ba\mathrm{经验值gydF4y2Ba}（gydF4y2Ba\mathrm{我gydF4y2Ba}\mathrm{\varphi gydF4y2Ba}［gydF4y2Ba\mathrm{lngydF4y2Ba}{\mathrm{年代gydF4y2Ba}}_{\mathrm{tgydF4y2Ba}}+gydF4y2Ba（gydF4y2Ba\mathrm{rgydF4y2Ba}-gydF4y2Ba\mathrm{问gydF4y2Ba}-gydF4y2Ba\frac{{\mathrm{\sigma gydF4y2Ba}}^{\mathrm{2gydF4y2Ba}}}{\mathrm{2gydF4y2Ba}}）gydF4y2Ba\mathrm{\tau gydF4y2Ba}］gydF4y2Ba-gydF4y2Ba\frac{{\mathrm{\varphi gydF4y2Ba}}^{\mathrm{2gydF4y2Ba}}{\mathrm{\sigma gydF4y2Ba}}^{\mathrm{2gydF4y2Ba}}}{\mathrm{2gydF4y2Ba}}\mathrm{\tau gydF4y2Ba}）gydF4y2Ba\\ {\mathrm{米gydF4y2Ba}}_{\mathrm{1gydF4y2Ba}}＝gydF4y2Ba\frac{\mathrm{1gydF4y2Ba}}{\mathrm{2gydF4y2Ba}}，gydF4y2Ba{\mathrm{米gydF4y2Ba}}_{\mathrm{2gydF4y2Ba}}＝gydF4y2Ba-gydF4y2Ba\frac{\mathrm{1gydF4y2Ba}}{\mathrm{2gydF4y2Ba}}\end{array}$$

$$\begin{array}{l}\mathrm{CgydF4y2Ba}\mathrm{一个gydF4y2Ba}\mathrm{lgydF4y2Ba}\mathrm{lgydF4y2Ba}（gydF4y2Ba\mathrm{KgydF4y2Ba}）gydF4y2Ba＝gydF4y2Ba{\mathrm{年代gydF4y2Ba}}_{\mathrm{tgydF4y2Ba}}{\mathrm{egydF4y2Ba}}^{-gydF4y2Ba\mathrm{问gydF4y2Ba}\mathrm{\tau gydF4y2Ba}}{\mathrm{PgydF4y2Ba}}_{\mathrm{1gydF4y2Ba}}-gydF4y2Ba\mathrm{KgydF4y2Ba}{\mathrm{egydF4y2Ba}}^{-gydF4y2Ba\mathrm{rgydF4y2Ba}\mathrm{\tau gydF4y2Ba}}{\mathrm{PgydF4y2Ba}}_{\mathrm{2gydF4y2Ba}}\\ \mathrm{PgydF4y2Ba}\mathrm{ugydF4y2Ba}\mathrm{tgydF4y2Ba}（gydF4y2Ba\mathrm{KgydF4y2Ba}）gydF4y2Ba＝gydF4y2Ba\mathrm{CgydF4y2Ba}\mathrm{一个gydF4y2Ba}\mathrm{lgydF4y2Ba}\mathrm{lgydF4y2Ba}（gydF4y2Ba\mathrm{KgydF4y2Ba}）gydF4y2Ba+gydF4y2Ba\mathrm{KgydF4y2Ba}{\mathrm{egydF4y2Ba}}^{-gydF4y2Ba\mathrm{rgydF4y2Ba}\mathrm{\tau gydF4y2Ba}}-gydF4y2Ba{\mathrm{年代gydF4y2Ba}}_{\mathrm{tgydF4y2Ba}}{\mathrm{egydF4y2Ba}}^{-gydF4y2Ba\mathrm{问gydF4y2Ba}\mathrm{\tau gydF4y2Ba}}\\ {\mathrm{PgydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}＝gydF4y2Ba\frac{\mathrm{1gydF4y2Ba}}{\mathrm{2gydF4y2Ba}}+gydF4y2Ba\frac{\mathrm{1gydF4y2Ba}}{\mathrm{\pi gydF4y2Ba}}{\displaystyle \underset{\mathrm{0gydF4y2Ba}}{\overset{\mathrm{\infty gydF4y2Ba}}{\int gydF4y2Ba}}\mathrm{再保险gydF4y2Ba}［gydF4y2Ba\frac{{\mathrm{egydF4y2Ba}}^{-gydF4y2Ba\mathrm{我gydF4y2Ba}\mathrm{\varphi gydF4y2Ba}\mathrm{lngydF4y2Ba}（gydF4y2Ba\mathrm{KgydF4y2Ba}）gydF4y2Ba}{\mathrm{fgydF4y2Ba}}_{\mathrm{jgydF4y2Ba}}（gydF4y2Ba\mathrm{\varphi gydF4y2Ba}）gydF4y2Ba}{\mathrm{我gydF4y2Ba}\mathrm{\varphi gydF4y2Ba}}］gydF4y2Ba\mathrm{dgydF4y2Ba}\mathrm{\varphi gydF4y2Ba}}\end{array}$$

$$\begin{array}{l}\mathrm{CgydF4y2Ba}\mathrm{一个gydF4y2Ba}\mathrm{lgydF4y2Ba}\mathrm{lgydF4y2Ba}（gydF4y2Ba\mathrm{kgydF4y2Ba}）gydF4y2Ba＝gydF4y2Ba{\mathrm{年代gydF4y2Ba}}_{\mathrm{tgydF4y2Ba}}{\mathrm{egydF4y2Ba}}^{-gydF4y2Ba\mathrm{问gydF4y2Ba}\mathrm{\tau gydF4y2Ba}}-gydF4y2Ba\frac{\sqrt{\mathrm{KgydF4y2Ba}}{\mathrm{egydF4y2Ba}}^{-gydF4y2Ba\mathrm{\tau gydF4y2Ba}\mathrm{tgydF4y2Ba}}}{\mathrm{\pi gydF4y2Ba}}{\displaystyle \underset{\mathrm{0gydF4y2Ba}}{\overset{\mathrm{\infty gydF4y2Ba}}{\int gydF4y2Ba}}\mathrm{再保险gydF4y2Ba}［gydF4y2Ba{\mathrm{KgydF4y2Ba}}^{-gydF4y2Ba\mathrm{我gydF4y2Ba}\mathrm{ugydF4y2Ba}}{\mathrm{fgydF4y2Ba}}_{\mathrm{2gydF4y2Ba}}（gydF4y2Ba\mathrm{\varphi gydF4y2Ba}＝gydF4y2Ba（gydF4y2Ba\mathrm{ugydF4y2Ba}-gydF4y2Ba\frac{\mathrm{我gydF4y2Ba}}{\mathrm{2gydF4y2Ba}}）gydF4y2Ba）gydF4y2Ba\frac{\mathrm{1gydF4y2Ba}}{{\mathrm{ugydF4y2Ba}}^{\mathrm{2gydF4y2Ba}}+gydF4y2Ba\frac{\mathrm{1gydF4y2Ba}}{\mathrm{4gydF4y2Ba}}}］gydF4y2Ba}\mathrm{dgydF4y2Ba}\mathrm{ugydF4y2Ba}\\ \mathrm{PgydF4y2Ba}\mathrm{ugydF4y2Ba}\mathrm{tgydF4y2Ba}（gydF4y2Ba\mathrm{KgydF4y2Ba}）gydF4y2Ba＝gydF4y2Ba\mathrm{CgydF4y2Ba}\mathrm{一个gydF4y2Ba}\mathrm{lgydF4y2Ba}\mathrm{lgydF4y2Ba}（gydF4y2Ba\mathrm{KgydF4y2Ba}）gydF4y2Ba＝gydF4y2Ba\mathrm{KgydF4y2Ba}{\mathrm{egydF4y2Ba}}^{-gydF4y2Ba\mathrm{\tau gydF4y2Ba}\mathrm{tgydF4y2Ba}}-gydF4y2Ba{\mathrm{年代gydF4y2Ba}}_{\mathrm{tgydF4y2Ba}}{\mathrm{egydF4y2Ba}}^{-gydF4y2Ba\mathrm{问gydF4y2Ba}\mathrm{\tau gydF4y2Ba}}\end{array}$$