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abushov2011
@abushov2011
August 2022
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помогите пожалуйста!
дана арифметическая прогрессия an. Вычислите сумму 3 членов, если a15=-32 d=-3
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Ger02
D=a2-a1(a16-a15) отсюда выразим a16=d+a15
a1+an
S= -------- • n
2
ЛИБО
2a1+d(n-1)
S= ------------------ • n
2
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Answers & Comments
a1+an
S= -------- • n
2
ЛИБО
2a1+d(n-1)
S= ------------------ • n
2