\begin{cminipage}[fond3]
\begin{center}$ \left(\frac{1+x}{1-x}\right)^m = {1 + {{2}m}x + {{2}m^{2}}x^{2} + \left({{{4}\over{3}}m^{3} + {{2}\over{3}}m}\right) x^{3} + \left({{{2}\over{3}}m^{4} + {{4}\over{3}}m^{2}}\right) x^{4}+ O(x^{5})} $\end{center}
\end{cminipage}