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настяалина
@настяалина
July 2022
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Дана геометрическая прогрессия -1/4,-1/2;-1...Найдите сумму первых пяти её членов.
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олятруш
G=b2/b1=-1/2 / -1/4=2
Sn
=
b1
(q^
n – 1)/ (q – 1)
S5=-1/4(2^5-1)/(2-1)=-1/4*31=-31/4=-7 3/4=-7,75
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Answers & Comments
Sn = b1 (q^n – 1)/ (q – 1)
S5=-1/4(2^5-1)/(2-1)=-1/4*31=-31/4=-7 3/4=-7,75