Răspunsuri

2014-11-15T13:06:04+02:00
2014-11-15T13:13:21+02:00
(a+b+c)*(a+b+c) = (a+b+c) la puterea 2
(a-b+c)*(a-b-c)= a la 2 -2ab+b la 2 - c la 2