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Tiffanie24
@Tiffanie24
May 2019
2
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Bonjour, j'ai cet exercice à faire pour demain et je ne sais pas comment faire ... C'est un calcul mental. Je suis en 3ème. Je vous remercie d'avance pour vos réponses !
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Commentaires (1)
Bonsoir
calcul mental
99² = ( 100 - 1)²
102 x 98 = ( 100 + 2) ( 100 - 2)
31² = ( 30 + 1)²
2 votes
Thanks 1
Tiffanie24
Merci beaucoup pour votre aide ! :)
MassGrgs
Dsl je sais pas mais essaye de decomposer avec ta calculatrice
1 votes
Thanks 0
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calcul mental
99² = ( 100 - 1)²
102 x 98 = ( 100 + 2) ( 100 - 2)
31² = ( 30 + 1)²