Réponses

2012-09-16T14:30:46+02:00

x - [y-(z+1)]-(x+[z-(x-2)] +y-1

= x - (y-z-1)-(x+z-x+2) +y-1

= x - (y-z-1)-(z+2) +y-1

= x - y + z + 1 - z - 2 + y -1

= x - 2

 

En espérant t'avoir aidé.