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Федор20012
@Федор20012
September 2021
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дана геометрическая прогрессия 1;-2;4...Найдите сумму первых 6 её членов
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ShirokovP
Verified answer
B1 = 1
b2 = - 2
q = b2/b1 = - 2/1 = - 2
S6 = (b1*(1 - q^6))/(1 - q) = (1*(1 - (-2)^6))/(1 + 2) = - 21
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Answers & Comments
Verified answer
B1 = 1b2 = - 2
q = b2/b1 = - 2/1 = - 2
S6 = (b1*(1 - q^6))/(1 - q) = (1*(1 - (-2)^6))/(1 + 2) = - 21