Sagot :
Réponse :
Explications étape par étape
Bjr,
Je te fais les 4 premières de chaque liste , que tu comprennes comment faire, sinon, c'est trop long!
x+7 = 0
x= -7
x-1 = 0
x=1
2x +4 = 0
2x= -4
x = -4/2 = -2
3x -9 = 0
3x = 9
x= 9/3 = 3
x+7 = 2
x= 2-7 = -5
x-1 = 8
x= 8+1 =9
2x+4 = 4
2x = 4-4
2x=0
x= 0
x+7= 2x+4
7-4 = 2x-x
3 = x
x-1 = -8x+1
x+8x = 1+1
9x = 2
x = 2/9 ( corrigé!!)
2x+4 =4x-5
4+5 = 4x -2x
9 = 2x
x = 9/2
☺
Bonjour,
J'en fais quelques unes de la dernière colonne pour te montrer la méthode :
x + 7 = 2x + 4
7 - 4 = 2x - x
x = 3
x - 1 = - 8x + 1
x + 8x = 1 + 1
9x = 2
x = 2/9
2x + 4 = 4x - 5
4 + 5 = 4x - 2x
9 = 2x
x = 9/2 = 4,5
3x - 9 = 2 + 9x
-9 - 2 = 9x - 3x
-11 = 6x
x = -11/6
9x + 12 = 9 - 4x
9x + 4x = 9 - 12
13x = - 3
x = -3/13
-x + 4 = 6 + 2x
4 - 6 = 2x + x
-2 = 3x
x = -2/3
-6x + 2 = 9 - 3x
2 - 9 = -3x + 6x
3x = -7
x = -7/3
-5x - 15 = -3x + 4
-15 - 4 = -3x + 5x
2x = -19
x = -19/2 = -9,5
=> Maintenant que tu as compris la méthode à toi de continuer, si tu as des questions n'hésite pas