Bonsoir juste un p'tit truc s'il vous plais : Comment calculer : (6+2√5)² + (6-2√5)².... Pergunta de ideia deyurihinatori25

yurihinatori25 @yurihinatori25

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Bonsoir juste un p'tit truc s'il vous plais :

Comment calculer :
(6+2√5)² + (6-2√5)²

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$\displaystyle(6+2\sqrt{5} )^{2} +(6-2\sqrt{5} )^{2} =6^2+2\times6\times2\sqrt{5} +(2\sqrt{5} )^2+6^2-2\times6\times2\sqrt{5} +(2\sqrt{5} )^2=\\=36+24\sqrt{5} +20+36-24\sqrt{5} +20=36+20+36+20=112$

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