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Ответ

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matilda17562

Ответ:

11.

Объяснение:

(2√5 - 3)(2√5 + 3) = (2√5)^2 - 3^2 = 4•5 - 9 = 20 - 9 = 11.

Использована формула разности квадратов:

(а-b)(a+b) = a^2 - b^2.

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