$$\begin{array}{l}\mathrm{P.}1={\displaystyle \underset{\mathrm{K.}=2}{\overset{\infty }{\pi }}1-\frac{1}{{\mathrm{K.}}^2}}那\\ \mathrm{P.}2={\displaystyle \underset{\mathrm{K.}=2}{\overset{\infty }{\pi }}\frac{{\mathrm{K.}}^2}{{\mathrm{K.}}^2-1}}。\end{array}$$

$$\mathrm{P.}={\displaystyle \underset{\mathrm{K.}=1}{\overset{10000}{\pi }}\frac{{\mathrm{E.}}^{\mathrm{K.}\mathrm{X.}}}{\mathrm{X.}}}。$$

$$\begin{array}{l}\mathrm{P.}1={\displaystyle \underset{\mathrm{K.}}{\pi }\mathrm{K.}}那\\ \mathrm{P.}2={\displaystyle \underset{\mathrm{K.}}{\pi }\frac{2\mathrm{K.}-1}{{\mathrm{K.}}^2}}。\end{array}$$