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alina05012003
@alina05012003
August 2022
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Найдите сумму ряда:1)1-1/3+1/9-1/27+...;2)1+1/5+1/25+1/125... .
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sedinalana
Решение смотри на фото
2 votes
Thanks 7
alina05012003
Спасибо большое!!!!!!!!!!!!!!!1
ВладимирБ
Verified answer
1
a1=1
a2=-1/3
q=a2/a1=-1/3
S=a1/(1-q)
S=1:(1+1/3)=1:4/3=3/4
2
a1=1
a2=1/5
q=a2/a1=1/5
S=1:(1-1/5)=1:4/5=5/4=1,25
8 votes
Thanks 10
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Answers & Comments
Verified answer
1a1=1
a2=-1/3
q=a2/a1=-1/3
S=a1/(1-q)
S=1:(1+1/3)=1:4/3=3/4
2
a1=1
a2=1/5
q=a2/a1=1/5
S=1:(1-1/5)=1:4/5=5/4=1,25