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NooPseudo
@NooPseudo
April 2019
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Bonjour, j'ai un exercice de maths à faire pour demain (pour ceux qui ont le livre Triangle de Hatier maths 4ème : c'est l'exercice 37 page 76).
Voici les équations :
a) déja fait.
b) 13-3(-a+3) = 5(3-a)+2
c) 2m-3(5-3m) = 3m+4
d) 2(n-3)-5(n-7) = 0
PS ; On doit faire avec un système de balance.
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Margoow2
B) 13-3(-a+3) = 5(3-a)+2
b) 13 + 3a - 9 = 15 - 5a + 2
3a + 5a = 15 + 2 - 13 + 9
8a = 13
a = 13/8
c) 2m-3(5-3m) = 3m+4
2m - 15 + 9m = 3m + 4
2m + 9m - 3m = 4 +15
8m = 19
m = 19/8
d) 2(n-3)-5(n-7) = 0
2n - 6 - 5n + 35 = 0
-3n = - 35 + 6
-3n = - 29
n = 29/3
2 votes
Thanks 1
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Bonjour, voila jai un exercice pour demain mais je n'y arrive pas aidez moi svp :)
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Lista de comentários
b) 13 + 3a - 9 = 15 - 5a + 2
3a + 5a = 15 + 2 - 13 + 9
8a = 13
a = 13/8
c) 2m-3(5-3m) = 3m+4
2m - 15 + 9m = 3m + 4
2m + 9m - 3m = 4 +15
8m = 19
m = 19/8
d) 2(n-3)-5(n-7) = 0
2n - 6 - 5n + 35 = 0
-3n = - 35 + 6
-3n = - 29
n = 29/3