Équations maths 3ème A) 3(x-1) + 2(x+3) = 0 B) -5(x+2) + 3(x-3) = 7 C) 5(2x-1) = 3(2x+5)
Mathématiques
MaelleH
Question
Équations maths 3ème
A) 3(x-1) + 2(x+3) = 0
B) -5(x+2) + 3(x-3) = 7
C) 5(2x-1) = 3(2x+5)
A) 3(x-1) + 2(x+3) = 0
B) -5(x+2) + 3(x-3) = 7
C) 5(2x-1) = 3(2x+5)
1 Réponse
-
1. Réponse Anonyme
A)
3(x - 1) + 2(x + 3) = 0
3x - 3 + 2x + 6 = 0
5x + 3 = 0
5x = - 3
x = - 3/5
B)
- 5(x + 2) + 3(x - 3) = 7
- 5x - 10 + 3x - 9 = 7
- 2x = 7 + 10 + 9
- 2x = 26
x = 26/-2
x = - 13
C)
5(2x - 1) = 3(2x + 5)
10x - 5 = 6x + 15
10x - 6x = 15 + 5
4x = 20
x = 20/4
x = 5