Предмет: Алгебра, автор: Аноним

Дана арифметическая прогрессия: −7 ; −4 ; -1 …. Найдите сумму первых восьми её членов.

Ответы

Автор ответа: Pomogy

-7;-4;-1;2;5;8;11;14.

сложить нужно все числа.

ответ : 28

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