в арифметической прогрессии разность равна 0,6 первый член равен а1=6,2. Найдите сумму 13 её - №6756270

в арифметической прогрессии разность равна 0,6 первый член равен а1=6,2. Найдите сумму 13 её членов
- Предмет:
  Алгебра
- Автор:
  alexia
- 6 лет назад

Ответы 1

a1=6,2d=0,6n=13S13=2a1+d(n-1)/2 *nS13=2*6,2 + 0.6(13-1)/2 *13=127.4 Ответ: 127.4
- Автор:
  beckhamckpa
- 6 лет назад
- 0
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