$$y=F（（X|{\nu }_1，，，，{\nu }_2）=\frac{\gamma [[\frac{（（{\nu }_1+{\nu }_2）}{2}这是给予的}{\gamma （（\frac{{\nu }_1}{2}）\gamma （（\frac{{\nu }_2}{2}）}{（（\frac{{\nu }_1}{{\nu }_2}）}^{\frac{{\nu }_1}{2}}\frac{X^{\frac{{\nu }_1-2}{2}}}{{[[1+（（\frac{{\nu }_1}{{\nu }_2}）X这是给予的}^{\frac{{\nu }_1+{\nu }_2}{2}}}$$

$$F（（{\nu }_1，，，，{\nu }_2）=\frac{\raisebox{1ex}{${\chi }_1$}\!\left/ \!\raisebox{-1ex}{${\nu }_1$}\right.}{\raisebox{1ex}{${\chi }_2$}\!\left/ \!\raisebox{-1ex}{${\nu }_2$}\right.}$$