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LemanPro
@LemanPro
September 2021
2
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Найдите сумму 7 первых членов геометрической прогрессии
-12,-24,-48,,,,,
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nekitmochantoha
-96,-192,-384,-768,-1536,-3072,-6344
0 votes
Thanks 1
LemanPro
спасибо
Pacanka202
Q=b2/b1=-24/-12=2
b1•(q^7–1) -12•127
S7 = --------------- = ----------- = –1524
q–1 1
1 votes
Thanks 1
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b1•(q^7–1) -12•127
S7 = --------------- = ----------- = –1524
q–1 1