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Timoteydemassie
@Timoteydemassie
April 2019
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I) Soient a= 2√45 et b=√80
1) Calculer a+b
On donnera le résultat sous la forme c√d où d est un entier le plus petit possible et en justifiant votre calcul.
2) Calculer ab.
3) Le nombre a est-il solution de l’équation ci-dessus ? Justifier.
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Commentaires (1)
a= 2√45 et b=√80
a+b=2
√(9*5)+
√(16*5)
=2*3
√5+4
√5
=10
√5
ab=2
√45*
√80
=2
√(45*80)
=2
√3600
=120
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Thanks 1
timoteydemassie
la 3 l'équation c'est x² -2x -180 = - 12racine carré de 5
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je n'arrive pas mon dm de math pouvez vous m'aider
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a+b=2√(9*5)+√(16*5)
=2*3√5+4√5
=10√5
ab=2√45*√80
=2√(45*80)
=2√3600
=120