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Que vaut \displaystyle{\frac{3^{20}+3^{22}}{3}} ?
\displaystyle{3^{40}}
\displaystyle{10\cdot 3^{21}}
\displaystyle{10\cdot 3^{41}}
\displaystyle{3^{41}}
\displaystyle{4\cdot 3^{19}}
\displaystyle{4\cdot 3^{21}}
\displaystyle{4\cdot 3^{41}}
\displaystyle{10\cdot 3^{19}}
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