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PetitPoteau
@PetitPoteau
April 2019
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Je n'arrive pas à résoudre ces deux équations :
a) x² = 25/16
b) 7x² + 3 = 6x² + 27
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Dareen
A)
ou -5/4
b) 7x^2-6x^2=27-3
ou - 2
0 votes
Thanks 1
Dareen
en effet :p
Commentaires (3)
A) x²-25/16 = 0
(x-5/4)(x+5/4) = 0
x = 5/4 ou -5/4
7x²+3-x²-27 = 0
6x² -24 = 0
6x² = 24
x² = 4
x = V2 ou -V2
6x² =
0 votes
Thanks 1
PetitPoteau
Oui j'avais remarqué, merci ! :)
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b) 7x^2-6x^2=27-3
(x-5/4)(x+5/4) = 0
x = 5/4 ou -5/4
7x²+3-x²-27 = 0
6x² -24 = 0
6x² = 24
x² = 4
x = V2 ou -V2
6x² =