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Оlolosa
@Оlolosa
August 2022
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bn-геометрическая прогрессия,знаменатель прогрессии равен 3,b1=3/5.Найдите сумму первых 7 её членов.
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mikael2
Verified answer
B1=3/5 q=3 sn=b1*(qⁿ-1)/(q-1)
s7=3/5*[(3⁷-1)/(3-1)]=(3/5)*2186/2=655.8
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Verified answer
B1=3/5 q=3 sn=b1*(qⁿ-1)/(q-1)s7=3/5*[(3⁷-1)/(3-1)]=(3/5)*2186/2=655.8