Réponses

2013-09-22T08:48:16+02:00
(-5) - (+10 ) + (+7 ) = -8
(+7) + ( +11 ) -( + 20 ) = -2
2013-09-22T10:54:48+02:00
(-5) - (+10 ) + (+7 ) = -8
(+7) + ( +11 ) -( + 20 ) = -2