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(a+b)(b+a)=ala puterea 2 + b la puterea 2 ?

Răspuns :

(a+b)(b+a) = (a+b)(a+b) = (a+b)² = a² + 2ab + b²
(a + b)·(b + a) =
= (a + b)·(a + b)
= (a + b)²
= a² + 2ab + b²