Предмет: Алгебра, автор: ersingazinaa36

-19; -17; -15; … Отрицательные члены арифметической прогрессии
Найдите сумму.

Ответы

Автор ответа: daraulanova835

Ответ:

Это получается арифметическая прогрессия, первый член а1=-17, последний член суммы а17=-1, всего членов 17, тогда сумма равна 0,5*(а1+an)*n=0,5*(-17-1)*17=-9*17=-153.

Ответ: -153.

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