Răspunsuri

2014-03-30T16:03:43+03:00
Aplici formula (a+b+c)² = a² + b² + c² +2ab+ 2ac + 2bc

Cel mai inteligent răspuns!
2014-03-30T16:05:56+03:00
(a+b+c)²=(a+b+c)(a+b+c)=a²+ab+ac+ab+b²+bc+ac+bc+c²=a²+b²+c²+2ab+2ac+2bc
Deci doar desfaci parantezele. 
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