$$\mathrm{XgydF4y2Ba}＝gydF4y2Ba\mathrm{KgydF4y2Ba}\cdot gydF4y2Ba\mathrm{年代gydF4y2Ba}$$

$$\begin{array}{l}{\mathrm{我gydF4y2Ba}}_{\mathrm{ggydF4y2Ba}\mathrm{一个gydF4y2Ba}\mathrm{我gydF4y2Ba}\mathrm{ngydF4y2Ba}}＝gydF4y2Ba{\mathrm{10gydF4y2Ba}}^{\mathrm{0．5gydF4y2Ba}\mathrm{一个gydF4y2Ba}/gydF4y2Ba\mathrm{20.gydF4y2Ba}}\\ {\mathrm{问gydF4y2Ba}}_{\mathrm{ggydF4y2Ba}\mathrm{一个gydF4y2Ba}\mathrm{我gydF4y2Ba}\mathrm{ngydF4y2Ba}}＝gydF4y2Ba{\mathrm{10gydF4y2Ba}}^{-gydF4y2Ba\mathrm{0．5gydF4y2Ba}\mathrm{一个gydF4y2Ba}/gydF4y2Ba\mathrm{20.gydF4y2Ba}}\\ {\mathrm{\theta gydF4y2Ba}}_{\mathrm{我gydF4y2Ba}}＝gydF4y2Ba-gydF4y2Ba（gydF4y2Ba\frac{\mathrm{PgydF4y2Ba}}{\mathrm{2gydF4y2Ba}}）gydF4y2Ba（gydF4y2Ba\frac{\mathrm{\pi gydF4y2Ba}}{\mathrm{180gydF4y2Ba}}）gydF4y2Ba\\ {\mathrm{\theta gydF4y2Ba}}_{\mathrm{问gydF4y2Ba}}＝gydF4y2Ba\frac{\mathrm{\pi gydF4y2Ba}}{\mathrm{2gydF4y2Ba}}+gydF4y2Ba（gydF4y2Ba\frac{\mathrm{PgydF4y2Ba}}{\mathrm{2gydF4y2Ba}}）gydF4y2Ba（gydF4y2Ba\frac{\mathrm{\pi gydF4y2Ba}}{\mathrm{180gydF4y2Ba}}）gydF4y2Ba\end{array}$$

$$\mathrm{KgydF4y2Ba}＝gydF4y2Ba［gydF4y2Ba\begin{array}{cc}{\mathrm{我gydF4y2Ba}}_{\mathrm{ggydF4y2Ba}\mathrm{一个gydF4y2Ba}\mathrm{我gydF4y2Ba}\mathrm{ngydF4y2Ba}}\mathrm{因为gydF4y2Ba}（gydF4y2Ba{\mathrm{\theta gydF4y2Ba}}_{\mathrm{我gydF4y2Ba}}）gydF4y2Ba& {\mathrm{问gydF4y2Ba}}_{\mathrm{ggydF4y2Ba}\mathrm{一个gydF4y2Ba}\mathrm{我gydF4y2Ba}\mathrm{ngydF4y2Ba}}\mathrm{因为gydF4y2Ba}（gydF4y2Ba{\mathrm{\theta gydF4y2Ba}}_{\mathrm{问gydF4y2Ba}}）gydF4y2Ba\\ {\mathrm{我gydF4y2Ba}}_{\mathrm{ggydF4y2Ba}\mathrm{一个gydF4y2Ba}\mathrm{我gydF4y2Ba}\mathrm{ngydF4y2Ba}}\mathrm{罪gydF4y2Ba}（gydF4y2Ba{\mathrm{\theta gydF4y2Ba}}_{\mathrm{我gydF4y2Ba}}）gydF4y2Ba& {\mathrm{问gydF4y2Ba}}_{\mathrm{ggydF4y2Ba}\mathrm{一个gydF4y2Ba}\mathrm{我gydF4y2Ba}\mathrm{ngydF4y2Ba}}\mathrm{罪gydF4y2Ba}（gydF4y2Ba{\mathrm{\theta gydF4y2Ba}}_{\mathrm{问gydF4y2Ba}}）gydF4y2Ba\end{array}］gydF4y2Ba$$

$$\mathrm{YgydF4y2Ba}＝gydF4y2Ba\mathrm{RgydF4y2Ba}\cdot gydF4y2Ba\mathrm{XgydF4y2Ba}$$

$$\mathrm{RgydF4y2Ba}＝gydF4y2Ba{\mathrm{KgydF4y2Ba}}^{-gydF4y2Ba\mathrm{1gydF4y2Ba}}$$

$$\begin{array}{c}\mathrm{ygydF4y2Ba}＝gydF4y2Ba{\mathrm{wgydF4y2Ba}}_{\mathrm{1gydF4y2Ba}}\mathrm{xgydF4y2Ba}+gydF4y2Ba{\mathrm{wgydF4y2Ba}}_{\mathrm{2gydF4y2Ba}}\mathrm{连词gydF4y2Ba}（gydF4y2Ba\mathrm{xgydF4y2Ba}）gydF4y2Ba\\ ＝gydF4y2Ba{\mathrm{wgydF4y2Ba}}_{\mathrm{1gydF4y2Ba}}（gydF4y2Ba\mathrm{xgydF4y2Ba}+gydF4y2Ba（gydF4y2Ba\raisebox{1ex}{${\mathrm{wgydF4y2Ba}}_{\mathrm{2gydF4y2Ba}}$}\!\left/ \!\raisebox{-1ex}{${\mathrm{wgydF4y2Ba}}_{\mathrm{1gydF4y2Ba}}$}\right.）gydF4y2Ba\mathrm{连词gydF4y2Ba}（gydF4y2Ba\mathrm{xgydF4y2Ba}）gydF4y2Ba）gydF4y2Ba\end{array}$$

$$\begin{array}{l}\mathrm{再保险gydF4y2Ba}｛gydF4y2Ba{\mathrm{wgydF4y2Ba}}_{\mathrm{1gydF4y2Ba}}｝gydF4y2Ba＝gydF4y2Ba（gydF4y2Ba{\mathrm{RgydF4y2Ba}}_{\mathrm{11gydF4y2Ba}}+gydF4y2Ba{\mathrm{RgydF4y2Ba}}_{\mathrm{22gydF4y2Ba}}）gydF4y2Ba/gydF4y2Ba\mathrm{2gydF4y2Ba}\\ \mathrm{即时通讯gydF4y2Ba}｛gydF4y2Ba{\mathrm{wgydF4y2Ba}}_{\mathrm{1gydF4y2Ba}}｝gydF4y2Ba＝gydF4y2Ba（gydF4y2Ba{\mathrm{RgydF4y2Ba}}_{\mathrm{21gydF4y2Ba}}-gydF4y2Ba{\mathrm{RgydF4y2Ba}}_{\mathrm{12gydF4y2Ba}}）gydF4y2Ba/gydF4y2Ba\mathrm{2gydF4y2Ba}\\ \mathrm{再保险gydF4y2Ba}｛gydF4y2Ba{\mathrm{wgydF4y2Ba}}_{\mathrm{2gydF4y2Ba}}｝gydF4y2Ba＝gydF4y2Ba（gydF4y2Ba{\mathrm{RgydF4y2Ba}}_{\mathrm{11gydF4y2Ba}}-gydF4y2Ba{\mathrm{RgydF4y2Ba}}_{\mathrm{22gydF4y2Ba}}）gydF4y2Ba/gydF4y2Ba\mathrm{2gydF4y2Ba}\\ \mathrm{即时通讯gydF4y2Ba}｛gydF4y2Ba{\mathrm{wgydF4y2Ba}}_{\mathrm{2gydF4y2Ba}}｝gydF4y2Ba＝gydF4y2Ba（gydF4y2Ba{\mathrm{RgydF4y2Ba}}_{\mathrm{21gydF4y2Ba}}+gydF4y2Ba{\mathrm{RgydF4y2Ba}}_{\mathrm{12gydF4y2Ba}}）gydF4y2Ba/gydF4y2Ba\mathrm{2gydF4y2Ba}\end{array}$$