Предмет: Алгебра, автор: MrAskro

Найдите сумму бесконечной геометрической прогрессии 28, -14, 7...

Ответы

Автор ответа: Kurtstan

0

Ответ: b1=28, b2=-14, b3=7, q=b2/b1=-14/28=-1/2

q=-1/2

Sn=b1/1-q

Sn=28/1+1/2=28/3/2

Sn=28×2/3=56/3

Объяснение:

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