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1iley3660p9fts0
@1iley3660p9fts0
July 2022
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Как найти b1 геометрическую прогрессии если известна S3=5 и q=1/2
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армения20171
1 votes
Thanks 1
1iley3660p9fts0
я не понял третию строчку
армения20171
b2=b1*q;b3=b1*q²
1iley3660p9fts0
а четвертая
NNNLLL54
вынесли общий множитель b1 за скобки и вместо q подставили 1/2.
NNNLLL54
Verified answer
S3=5
b1+b2+b3=5
b1+b1q+b1*q²=5
b1(1+1/2+1/4)=5
b1((4+2+1)/4=5
b1=20/7
2 votes
Thanks 1
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Answers & Comments
Verified answer
S3=5b1+b2+b3=5
b1+b1q+b1*q²=5
b1(1+1/2+1/4)=5
b1((4+2+1)/4=5
b1=20/7