Réponses

  • carys
  • Modératrice confirmée
2013-05-31T20:27:26+02:00

5x + 11 = 18

5x = 18 - 11

5x = 7

x = 7/5

x = 1.4

 

x/12 - 1 = 0,25

x/12 = 0.25 + 1

x/12 = 1.25

x = 1.25 * 12

x = 15

 

2(x + 7) = -1

2x + 14 = -1

2x = -1 - 14

2x = -15

x = -15/2

x = -7.5

 

x + 3/4 = 9

x = 9 - 3/4

x = 8.25

 

voilà :)

  • Utilisateur Brainly
2013-05-31T20:31:20+02:00

bonjour:je suis en 4eme

 

a)5x+11=18

5x=18-11

5x=7

x=7/5

x=1,4

 

c)2(x+7)=-1

2x+2x7=-1

2x+14=-1

2x=-1-14

2x=-15

x=-15/2

x=-7,5

 

d)x+3/4=9

x=9/1-3/4

x=36/4-3/4

x=33/4

x=8,25

 

jespere t'avoir aider :)