(bn) геометрическая прогрессия. Первый член равен 7,а знаменатель

none6 @none6

July 2022 1 31 Report

(bn) геометрическая прогрессия. Первый член равен 7,а знаменатель – (-2). Найдите первые шесть членов прогрессии.

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NNNLLL54

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Ответ:

$\{b_{n}\}\ \ ,\ \ b_1=7\ ,\ \ q=-2\\\\b_2=b_1q=7\cdot (-2)=-14\ \ \ ,\\\\b_3=b_2q=-14\cdot (-2)=28\ \ ,\\\\b_4=b_3q=28\cdot (-2)=-84\ \ \ ,\\\\b_5=b_4q=-84\cdot (-2)=168\ \ ,\\\\b_6=b_5q=168\cdot (-2)=-336$

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