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yngxsk
@yngxsk
July 2023
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СРОЧНОО У геометричній прогресії (bn) усі члени додатні. Знайдіть S5, якщо b3 = 18, b5 = 162.
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Аккаунт удален
Відповідь:
b3 = -18
b1 = -2
b5 = -162
b4 = -sqrt(-18*-162)= -54
bn = bn-1 * q
q = bn / bn-1 = b5 / b4 = 162 / 54 = 3
S5 = (-162 * 3 + 2) / 2 = -242
Можна будь ласка корону!!!!!
15 votes
Thanks 15
yngxsk
багато неточностей,звідки ви взяли в1??
seredavladimir52
Спасибо огромное
seredavladimir52
Респект тебе
shinratenseii
яке b3=-2, якщо всі члени додатні?
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Answers & Comments
b3 = -18
b1 = -2
b5 = -162
b4 = -sqrt(-18*-162)= -54
bn = bn-1 * q
q = bn / bn-1 = b5 / b4 = 162 / 54 = 3
S5 = (-162 * 3 + 2) / 2 = -242
Можна будь ласка корону!!!!!