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makslarin991
@makslarin991
July 2022
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Арифмитическая прогрессия. Вычисление суммы
a6= 6
d= 4.2
n= 20
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lovesummerliv
ai
=
a1+ (i-1)d
a1
=
ai
- (i-1)d
a1 = 6- (6-1)4.2 = -15
Sn
=
S20 =
1 votes
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Answers & Comments
a1 = ai- (i-1)d
a1 = 6- (6-1)4.2 = -15
Sn =
S20 =