Réponse:
C est simple !
(a+b)^2= a^2 +2ab +b^2
(a-b)^2= a^2-2ab +b^2
(a+b) (a-b) =a^2-ab +ab-b^2 =a^2 - b^2
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Réponse:
C est simple !
(a+b)^2= a^2 +2ab +b^2
(a-b)^2= a^2-2ab +b^2
(a+b) (a-b) =a^2-ab +ab-b^2 =a^2 - b^2