Предмет: Математика, автор: saninaaa

дана арифметическая прогрессия -19 -15 -11 какое число стоит на 81 месте?

Ответы

Автор ответа: dnepr1

Разность прогрессии равна: d = 15-(-19) = 4.
Энный член прогрессии равен:
an = a₁ + d(n-1).
На 81 месте стоит число:
а81 = -19 + 4*(81-1) = -19 + 320 = 301.

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