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CountessVictoria
@CountessVictoria
July 2022
1
5
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(bn)-геометрическая прогрессия,знаменатель прогрессии равен 1/7,b1=2058,найдите сумму первых 5 её членов
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Medrs
S5=
2058(1\49-1)
=
-2058*48\49
=
42*48*7
= 48*49 =2352
1\7-1 -6\7
6
4 votes
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1\7-1 -6\7 6