50 баллов геометрическая прогрессия срочнооооооооооооо!!!!!!!!!!!!!!!1. Created by anutaerm. algebra-ru

50 баллов геометрическая прогрессия срочнооооооооооооо!!!!!!!!!!!!!!!1...

anutaerm @anutaerm

September 2021 1 14 Report

50 баллов геометрическая прогрессия срочнооооооооооооо!!!!!!!!!!!!!!!1

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Verified answer

S_3 = b1 * (1-q^3) / (1-q)
78 = 54 * (1-q^3) / (1-q)
13/9 = (1-q)*(1+q+q^2) / (1-q)
9q^2+9q+9 = 13
9q^2 + 9q - 4 = 0
D = 81+4*9*4 = 15^2
(q)1;2 = (-9 +- 15) / 18 = (-3 +- 5) / 6
q1 = -8/6 = -4/3
q2 = 2/6 = 1/3
Ответ: -1

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