
\begin{enumerate}
\item $\pi^2\approx9,86960440109$ donc $9,8696 < \pi^2 < 9,8697$.
\item $\sqrt3\approx1,73205080757$ donc $1,732 < \sqrt3 < 1,733$.
\item $\sqrt5\approx2,2360679775$ donc $2,23606 < \sqrt5 < 2,23607$.
\item $\dfrac{1}{\pi}\approx0,318309886184$ donc $0,3 < \dfrac{1}{\pi} < 0,4$.
\item $\sqrt7+\sqrt{11}\approx5,96237610142$ donc $5 < \sqrt7+\sqrt{11} < 6$.
\item $\dfrac{2}{3}\approx0,666\ldots$ donc $0,66 < \dfrac{2}{3} < 0,67$.
\item $\dfrac{\sqrt2}{\sqrt3}\approx0,816496580928$ donc $0,8164 < \dfrac{\sqrt2}{\sqrt3}<0,8165$.
\item $-\dfrac{7}{11}\approx-0,636363636364$ donc $-0,63637 < -\dfrac{7}{11} < -0,63636$.
\end{enumerate}
