Bonjour HELP RESOUDRE LES 3 EQUATIONS ci dessous : A) 2(x/3 - 1) = x - 2/5 B) x-3/2= 2x+1 C) 1+2x/5x -4= -2/3 Merci d'avance !
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Question
Bonjour HELP RESOUDRE LES 3 EQUATIONS ci dessous :
A) 2(x/3 - 1) = x - 2/5
B) x-3/2= 2x+1
C) 1+2x/5x -4= -2/3
Merci d'avance !
A) 2(x/3 - 1) = x - 2/5
B) x-3/2= 2x+1
C) 1+2x/5x -4= -2/3
Merci d'avance !
1 Réponse
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1. Réponse maudmarine
Bonjour,
A) 2(x/3 - 1) = x - 2/5
2x/3 - 2 = x - 2/5
10/15x - 30/15 = 15/15x - 6/15
10x - 30 = 15x - 6
10x - 15x = - 6 + 30
- 5x = 24
x = 24/5
x = 4,8
B) x-3/2= 2x+1
2/2x - 3/2 = 4/2x + 2/2
2x - 4x = 2 + 3
- 2x = 5
x = - 5/2
x = - 2,5
C) 1+2/5x -4= -2/3
15/15 + 6/15x - 60/15 = - 10/15
6x = - 10 + 60 - 15
6x = - 35
x = - 35/6