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B1 b2 a1. (2a-b)2 - (2a+b)2 при а. A={A,1,2}, B={A,B,1};. A2-b2/ab 1/b-1/a. Ответ 1/ab-b^2 - 1/a^2-ab.
(2a-b)2 - (2a+b)2 при а. A={A,1,2}, B={A,B,1};. A2-b2/ab 1/b-1/a. Ответ 1/ab-b^2 - 1/a^2-ab.

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