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polikzaisheva12
@polikzaisheva12
July 2022
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Выписаны первые несколько членов арифметической прогрессии:
-3 ; 1 ; 5
Найдите сумму первых шести её членов ?
ответ дайте с решением
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shahmayckin
А6= а1 + д(6-1)
А6= -3+ 4*5= 17
S6 =(-3+17)/2*6= 42
2 votes
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Answers & Comments
А6= -3+ 4*5= 17
S6 =(-3+17)/2*6= 42