$$X=F^{-1}（\mathrm{P.}|{\nu }_1那{\nu }_2）=\left\{X：F（X|{\nu }_1那{\nu }_2）=\mathrm{P.}\right\}$$

$$\mathrm{P.}=F（X|{\nu }_1那{\nu }_2）={\displaystyle \underset{0.}{\overset{X}{\int }}\frac{\mathrm{\gamma .}\left[\frac{（{\nu }_1+{\nu }_2）}{2}\right]}{\mathrm{\gamma .}（\frac{{\nu }_1}{2}）\mathrm{\gamma .}（\frac{{\nu }_2}{2}）}}{（\frac{{\nu }_1}{{\nu }_2}）}^{\frac{{\nu }_1}{2}}\frac{{\mathrm{T.}}^{\frac{{\nu }_1-2}{2}}}{{\left[1+（\frac{{\nu }_1}{{\nu }_2}）\mathrm{T.}\right]}^{\frac{{\nu }_1+{\nu }_2}{2}}}\mathrm{D.}\mathrm{T.}$$