Réponses

  • Utilisateur Brainly
2013-05-16T18:04:43+02:00

1) A=2(3-4x) = 6-8x

B=10-3x+2 = 12-3x

 

2)

a)3x = 9(x-8)

3x = 9x -72

3x-9x = -72

-6x = -72

x = -72/-6

x = 12

 

b)10x-3(2x-15) = 7x

10x-6x-45 = 7x

-35 = 7x+6x

-35 = 13x

x = -35/13

 

Voila bon courage!