aidé moi pour la 54 svp .... Pergunta de ideia deassa36900000

assa36900000 @assa36900000

December 2021 1 97 Report

aidé moi pour la 54 svp

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DoucePatate

Bonsoir,

On remarque tout de suite une identité remarquable de la forme (a+b)(a-b) donc

$\frac{1}{2}* (0,5^{x} -1)* (0,5^{x} +1) = \frac{1}{2}* ((0,5^{x} )^{2} - 1^{2}) = \frac{1}{2}* (0,5^{2x} - 1) = \frac{0,5^{2x} - 1}{2}$

Bonne soirée

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