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up::[[arithmétique]]
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title::"$\left( \sum\limits_{k=0}^{n}a_{k} \right)^{2} = \sum\limits_{i=1}^{n}\left( \sum\limits_{j=1}^{n} a_{i}\times a_{j} \right)$"
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#maths/arithmétique
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#s/maths/arithmétique
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---
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$\left( \sum\limits_{k=0}^{n}a_{k} \right)^{2} = \sum\limits_{i=1}^{n}\left( \sum\limits_{j=1}^{n} a_{i}\times a_{j} \right)$
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