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kristina00vjqgf
@kristina00vjqgf
August 2022
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вычислите а13 если а 12=20 d=3
Арифметическая прогрессия
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Лена180
Надо тебе уровнения написать?
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kristina00vjqgf
Ответ и всё
Лена180
ответ 56
Romarvel
Формула арифметической прогрессии: a_{n} =a₁+d(n-1)
Поэтому a_{13} = a_{12} +d(13-1) = 20+3*12= 56
Ответ: 56
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Answers & Comments
Поэтому a_{13} = a_{12} +d(13-1) = 20+3*12= 56
Ответ: 56