Răspuns :
x+y+z=8005
x+y+c=3968+1936+c=8005⇒5904+c=8005⇒c=8005-5904⇒c=2101
Proba
3968+1936+2101=8005
x+y+c=3968+1936+c=8005⇒5904+c=8005⇒c=8005-5904⇒c=2101
Proba
3968+1936+2101=8005