Odpowiedzi

2010-03-10T18:54:44+01:00
A(a+b+c)-b(a-b+c)-c(a-b-c) =
= a²+ab+ac-ab+b²-bc-ac+bc+c² =
= a²+b²+c²
2010-03-10T18:56:07+01:00
A²+ab+ac-ab+b²-bc-ac+bc+c² =a²+b²+c²
2010-03-10T18:57:31+01:00