Răspuns :
a+b+c=6783
a+b=5714
b+c=4643
5714+c=6783
c=6783-5714=1069
a+5714=6783
a=6783-4643=2140
b=4643-1069=3574
a+b=5714
b+c=4643
5714+c=6783
c=6783-5714=1069
a+5714=6783
a=6783-4643=2140
b=4643-1069=3574