Предмет: Алгебра, автор: Аноним

Помогите пожалуйста .

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Автор ответа: NeverLove

3

4) (40+1)² = 40²+2×40×1+1² = 1600+80+1 = 1681
5) 47²-37² = (47+37)(47-37) = 84×10 = 840

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