Răspuns :
648-327=321 (c) 525-321=204 (b) 327-204=123 (a) verificare:321+204+123=648
a+b+c=648
c=648-327
c= 321
b=525-321
b= 204
a=327-204
a= 123
V=123+204+321=
= 327+321=
= 648