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Melmc
@Melmc
January 2021
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Salut peut tu m'aider , car je sais pas comment faire
Merci d'avance !
C) calculer mentalement 23 (au carré ) - 22 au carré
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trudelmichel
Verified answer
Bonjour,
utilisez les identites remarquables
23²-22²=
a²-b²=(a+b)(a-b)
23²-22²=(23+22)(23-22)='(45)(1)=45
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Thanks 1
Melmc
Merci beaucoup
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Verified answer
Bonjour,utilisez les identites remarquables
23²-22²=
a²-b²=(a+b)(a-b)
23²-22²=(23+22)(23-22)='(45)(1)=45