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elhadjimboup61
@elhadjimboup61
January 2021
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pouvez vous m'aidez s'il vous plaît c'est l'exercice 1
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ferrarirouge
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Salut ! le principe, c'est de tout mettre sur le même dénominateur.
pour la A je mets tout sur 12 ( en faisant 3*4 et 4*3)
A = 1- 1/3 + 1/4
= 12/12 - 4/12 + 3/12
= (12 - 4 + 3 )/12
= 11/12
Pour la B on met tout sur 54 car 9*6 = 54; 3*18 = 54,...
B = 2/3 - (2/9 - 1/6 + 2/3 )
= 36/54 - (12/54 - 9/54 + 36/54)
= 36/54 - ( (12 - 9 + 36)/54 )
= 36/54 - 39/54
= -3/54
2 votes
Thanks 1
elhadjimboup61
et la 2 s'il te plaît
ferrarirouge
javais pas vu... deux secondes
ferrarirouge
jarrive plus a repondre
ferrarirouge
aaah ! comment on fait ?!!
ferrarirouge
attends je vais vpir si je peux te lenvoyer pas message
ferrarirouge
merci ! tu as pu voir les messages ? je t'y ai mis les reponses....
elhadjimboup61
oui j'ai vue merçi beaucoup
ferrarirouge
derien
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Lista de comentários
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Salut ! le principe, c'est de tout mettre sur le même dénominateur.pour la A je mets tout sur 12 ( en faisant 3*4 et 4*3)
A = 1- 1/3 + 1/4
= 12/12 - 4/12 + 3/12
= (12 - 4 + 3 )/12
= 11/12
Pour la B on met tout sur 54 car 9*6 = 54; 3*18 = 54,...
B = 2/3 - (2/9 - 1/6 + 2/3 )
= 36/54 - (12/54 - 9/54 + 36/54)
= 36/54 - ( (12 - 9 + 36)/54 )
= 36/54 - 39/54
= -3/54