Предмет: Алгебра, автор: belousviktoria884

В залі 16 рядів ,причому в 1 ряду 20 стільців,а в кожному наступному на 4 більше скільки всього стільців в залі

ВикаБач: Сумма 16 членов арифметической прогрессии. a1=20; d=4; формула в учебнике.

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Автор ответа: broomspun1

Ответ:

дай лучший ответ пж

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