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Mazai1086
@Mazai1086
July 2022
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Найдите сумму семидесяти первых членов арифметической прогрессии(an) если a1=38,a70=178
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ShirokovP
Verified answer
A1 = 38
a70 = 178
S70 - ?
S70 = (a1 + a70)/2*70 = 35(a1 +a70) = 35*(38 + 178) =
= 35*216 = 7560
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Answers & Comments
Verified answer
A1 = 38a70 = 178
S70 - ?
S70 = (a1 + a70)/2*70 = 35(a1 +a70) = 35*(38 + 178) =
= 35*216 = 7560