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3Hal0
@3Hal0
September 2021
1
18
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Найдите сумму первых десяти членов геометрической прогрессии ,если ее пятый член равен -9 а знаменатель равен -3.
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Pacanka202
B5=b1•q^4
b1=b5/q^4=-9/81=-1/9
b1•(q^10–1) -1/9•59048
S10 = ---------------- = ----------------- =
q–1 -4
-59048 2
= ----------- = 1640 ----
9•(-4) 9
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b1=b5/q^4=-9/81=-1/9
b1•(q^10–1) -1/9•59048
S10 = ---------------- = ----------------- =
q–1 -4
-59048 2
= ----------- = 1640 ----
9•(-4) 9