Предмет: Математика, автор: Lemonbogdan

Алгебра, прогрессии.
Помогите с последними 3-мя.

Приложения:

Ответы

Автор ответа: sofiyavictoria

0

1).a5=a1+4d. d=-4. a5=3-16=-13

2). d=20-16=4. x=8+4=12

3).составим систему уравнений

-11,5=a1+8d

-22=a1+23d вычтем из 1-го уравнения 2-е и получим

10,5 = -15d. d=10,5/(-15). d=-0.7

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