Réponses

2014-05-04T20:26:52+02:00
Bonsoir

4x +6 = 13
4x = 13 -6
4x = 7
x = 7/4 = 1.75 donc vrai

4x = 9
x = 9/4
x= 2.25 donc faux

2x +1 = 4
2x = 4 -1
2x = 3
x =3/2 = 1.5 donc faux

12x +3 = 24
12x = 24 -3
12x = 21
x = 1.75 donc vrai
  • Utilisateur Brainly
2014-05-04T20:30:26+02:00
Bonjour, 

4x + 6 = 13
4x = 13 - 6
4x = 7
x = 7/4
x = 1,75

4x = 9
x = 9/4
x= 2,25 

2x + 1 = 4
2x = 4 - 1
2x = 3
x = 3/2 
x = 1,5

12x + 3 = 24
12x = 24 - 3
12x = 21
x = 21/12
x = 1,75

Bonne soirée! =)