[[attachment:Stages/2011-01-24/detecteur_derreeur.jpg|{{attachment:Stages/2011-01-24/detecteur_derreeur.jpg|detecteur_derreeur.jpg|width=1000}}]]


Le code UPC



a)	Soit le mot de 11 chiffres : 35602387190a12
On souhaite déterminer la valeur de a12 tel que ce mot soit un code UPC.


[[attachment:Stages/2011-01-24/upc1.jpg|{{attachment:Stages/2011-01-24/upc1.jpg|upc1.jpg}}]]

[[attachment:Stages/2011-01-24/upc2.jpg|{{attachment:Stages/2011-01-24/upc2.jpg|upc2.jpg}}]]

[[attachment:Stages/2011-01-24/upc3.jpg|{{attachment:Stages/2011-01-24/upc3.jpg|upc3.jpg}}]]
[[attachment:Stages/2011-01-24/upc4.jpg|{{attachment:Stages/2011-01-24/upc4.jpg|upc4.jpg}}]]
[[attachment:Stages/2011-01-24/upc5.jpg|{{attachment:Stages/2011-01-24/upc5.jpg|upc5.jpg}}]]
[[attachment:Stages/2011-01-24/isbn1.jpg|{{attachment:Stages/2011-01-24/isbn1.jpg|isbn1.jpg}}]]
[[attachment:Stages/2011-01-24/isbn2.jpg|{{attachment:Stages/2011-01-24/isbn2.jpg|isbn2.jpg}}]]
[[attachment:Stages/2011-01-24/isbn3.jpg|{{attachment:Stages/2011-01-24/isbn3.jpg|isbn3.jpg}}]]