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kps99
@kps99
July 2022
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а1=2 аn=100 n=50 sn=?
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KirillLity
S(n)=(a1+an/2)*n
S50=(2+100/2)*50=51*50=2550
Ответ:2550
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Answers & Comments
S50=(2+100/2)*50=51*50=2550
Ответ:2550