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formule de calcul prescurtat (a²+2a+5)²= ​

Răspuns :

Răspuns:

(a²+2a+5)²= (a²)²+2a²+5²+2×a²×2a+2×2a×5+2×a²×5

=a^4+4a²+25+4a^3+20a+10a²

=a^4+4a^3+14a²+20a+25