Réponses

2013-02-27T21:52:08+01:00
2013-02-27T21:55:41+01:00

a ) x= 27-15 donc x = 12

b ) 4x = 32 donc x = 32/4 = 8

c) 2x+3 = 16 donc 2x = 16-3, 2x = 13 et x = 13/2

d) 4x+7 = 2x -3 donc 4x-2x = -3-7  2x = -10, x = -5

e) 6x+12 = 5x  donc 6x-5x = -12  x = -12