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Anjelika20020707
@Anjelika20020707
August 2022
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докажите тождество: a^2-b^2=(a-b)^2+2ab
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aymeken
2ab-(a^2+2ab+b^2)+2a^2=2ab-a^2-2ab-b^2+2a^2=a^2-b^2=(a-b)(a+b)
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