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Danydaniel3
a fost răspuns

Demonstrati identitatile:
a) (a+b)²=a²+2ab+b²
b) (a-b)²=a²-2ab+b²
c) (a+b) (a-b) =a²-b²

Răspuns :

Dixie
a) (a+b)(a+b)=a²+ab+ba+b²=a²+2ab+b²
b) (a-b)(a-b)=a²-ab-ba+b²=a²-2ab+b²
c) (a-b)(a+b)=a²+ab-ba-b²=a²-b²