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NikaZ26
@NikaZ26
October 2021
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Сумма 8-ого и 15-ого члена арифметической прогрессии рана 48.найдите сумму первых 30-и членов.
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Удачник66
Verified answer
A8 + a15 = a1 + 7d + a1 + 14d = 2a1 + 21d = 48
S30 = (2a1 + 29d)*30/2 = (2a1 + 21d + 8d)*15 = (48 + 8d)*15
Как найти d и найти S30, непонятно.
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Answers & Comments
Verified answer
A8 + a15 = a1 + 7d + a1 + 14d = 2a1 + 21d = 48S30 = (2a1 + 29d)*30/2 = (2a1 + 21d + 8d)*15 = (48 + 8d)*15
Как найти d и найти S30, непонятно.