Réponses

2014-06-12T19:48:59+02:00
(12)+(3)-(-4)-(+6) =(12)+(3)+(+4)+(-6) =12+3+4-6 =15+4-6 =19-6 =13 Voila :)
2014-06-12T19:52:51+02:00
(12)+(3)-(-4)-(+6)
=12+3+(+4)-6
=12+3+4-6
=13

voilà :)