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Bonjour

soient [tex]x_{1};x_{2};............;x_{n}[/tex] des réels([tex]n\in \mathbb{N}^*[/tex])
montrer que [tex]\Large 2(\Large \sum_{p=1}^{p=n}{x_{p}})^2\leq n\Large \sum_{p=1}^{p=n}{x_{p}^{2}}[/tex]