Réponses

2013-04-09T22:21:28+02:00
((x/7)+7)*7=777
(x/7)+7=777/7=111
x/7=111-7=104
x=104*7=728
2013-04-09T22:22:11+02:00

728 car a la fin ya 777 on fait le chemin inverse

777/7 =111            

111-7=104

104*7=728