Предмет: Алгебра, автор: gvinpinv

В арифметической прогрессии второй член равен 7,а разность равна 8.Найдите 9 член этой прогрессии.

Ответы

Автор ответа: Аноним

0

Дано:

a2=7

d=8

Найти:

a9

Решение:

a1=a2-8=7-8=-1

a9=a1+8d=-1+64=63

=====================

Ответ: 63

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