Răspuns :
(a+b)+c=713
a+b=357
357+c=713
c=713-357=356
a+b+c=713, a+c=565
565+b=713, b=713-565=148
a+148+356=713
a+504=713
a=713-504=209
a+b=357
357+c=713
c=713-357=356
a+b+c=713, a+c=565
565+b=713, b=713-565=148
a+148+356=713
a+504=713
a=713-504=209