Réponses

2014-01-20T17:02:34+01:00
A) 10x - 2 = 0
A) 10x = 2
A) 10x/10 = 2/10 
A) x = 1/5

B) 4 - 7b =2b + 11
B) -9b = 7
B) -9b/9 = 7/9
B) -x = 7/9
B) x = -7/9

C) 3(2x-4) = 9-3(x-5)
C) 6x - 12 = 9 -3x  + 15
C) 3x = 12
C) 3x/3 = 12/3
C) x = 4
2014-01-20T17:07:18+01:00
A) 10x - 2 = 0
A) 10x = 2
A) 10x/10 = 2/10 
A) x = 1/5

B) 4 - 7b =2b + 11
B) -9b = 7
B) -9b/9 = 7/9
B) -x = 7/9
B) x = -7/9

C) 3(2x-4) = 9-3(x-5)
C) 6x - 12 = 9 -3x  + 15
C) 3x = 12
C) 3x/3 = 12/3
C) x = 4