Odpowiedzi

2009-10-23T16:53:59+02:00
2009-10-23T16:54:06+02:00
831+589 = 1420
831-589 = 242

1420 + 242 = 1662
2009-10-23T17:22:56+02:00
(831 + 589) + (831 - 589) = 1420 + 242 = 1662