Réponses

2013-02-13T18:32:12+01:00

1er exercice :

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

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

8x = -1/4

x=8*4/-2

x=-1/32

 

-4/5+y =3/10-1/2y

y+1/2y = 4/5+3/10

3/2y=11/10

y=11*2/10*3

y=11/15