Предмет: Алгебра, автор: den4ik73russia

Арифметическая прогрессия задана условием аn=-5,5+4,1n.найдите а12

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Автор ответа: Yena

3

$a_n=-5,5+4,1n \\ a_{12}=-5,5+4,1\cdot12=-5,5+49,2=43,7$

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