Răspunsuri

Cel mai inteligent răspuns!
2014-09-16T21:14:35+03:00
(a-b+c)²=a²-b²+c²+2ac-2bc-2ab
(a-b-b)²=(a+b)=a²+2ab+b²
(a+b+c)²=a²+b²+c²+2ac+2bc+2ab
2 5 2