muzic37 muzic37

22-01-2023
Mathematics

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За первый час работы каменщик укладывает 115 кирпичей, а за каждый последующий час на 15 кирпичей меньше, чем за предыдущий. Найдите, сколько кирпичей укладывает каменщик за 7 часов.

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