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a resposta é ![\geq \alpha \leq \left[\begin{array}{ccc}1&2&3\\4&5&6\\7&8&9\end{array}\right] \lim_{n \to \infty} a_n \int\limits^a_b {x} \, dx \lim_{n \to \infty} a_n =247](https://tex.z-dn.net/?f=+%5Cgeq++%5Calpha++%5Cleq+++%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7D1%26amp%3B2%26amp%3B3%5C%5C4%26amp%3B5%26amp%3B6%5C%5C7%26amp%3B8%26amp%3B9%5Cend%7Barray%7D%5Cright%5D++%5Clim_%7Bn+%5Cto+%5Cinfty%7D+a_n++%5Cint%5Climits%5Ea_b+%7Bx%7D+%5C%2C+dx++%5Clim_%7Bn+%5Cto+%5Cinfty%7D+a_n+%3D247 "\geq \alpha \leq \left[\begin{array}{ccc}1&2&3\\4&5&6\\7&8&9\end{array}\right] \lim_{n \to \infty} a_n \int\limits^a_b {x} \, dx \lim_{n \to \infty} a_n =247")
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