Răspuns :
a+b+c = 864
a = 1/4*864
a = 864/4
a = 216
b = c:7
c = 7*b
216+b+7b = 864
8b = 864-216
8b = 648
b = 648:8
b = 81
c = 7*b
c = 7*81
c = 567
216+81+567 = 297+567 = 864
a = 1/4*864
a = 864/4
a = 216
b = c:7
c = 7*b
216+b+7b = 864
8b = 864-216
8b = 648
b = 648:8
b = 81
c = 7*b
c = 7*81
c = 567
216+81+567 = 297+567 = 864
a=864:4
a=216
864-216=648(b+c)
c+b=648
7b+b=648
8b=648
b=648:8
b=81
c=648-81
c=567
a=216
864-216=648(b+c)
c+b=648
7b+b=648
8b=648
b=648:8
b=81
c=648-81
c=567