Дана арифметическая прогрессия (аn) найдите d, если s3=270 a1=-5 - №24688204

Дана арифметическая прогрессия (аn) найдите d, если s3=270 a1=-5
- Предмет:
  Математика
- Автор:
  ericktpnb
- 5 лет назад

Ответы 1

270=a1+a1+d+a1+2d3a1+3d=2703*(-5)+ 3d=270-15+3d=2703d=270+153d=285d=285:3d=95
- Автор:
  jocelynnh1g
- 5 лет назад
- 0
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