Найдите сумму первых пяти членов геометрической прогрессии (bn) если b1=1 ;q=-2 и объясните как это сделать самому пж - №31870586

Найдите сумму первых пяти членов геометрической прогрессии (bn) если b1=1 ;q=-2 и объясните как это сделать самому пж
- Предмет:
  Алгебра
- Автор:
  damari
- 5 лет назад

Ответы 1

S5=1*((-2)^5-1)/-2-1=1*(-32-1)/-3=-33/-3=11
- Автор:
  kristen
- 5 лет назад
- 0
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