Réponses

2013-03-24T16:42:56+01:00

9 + 7 + x/3 = 10

16 + x/3 = 10

x/3 = 10 - 16

x/3 = -6 

x = -6/ 3 = -2 

2013-03-24T16:43:33+01:00

salut alors :

10-9=1

1-7= -6

donc x3= -6

x= -6/3= -2