Предмет: Алгебра, автор: glebdeeway

знайдіть а1,якщо а6=17,а12=47​

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Автор ответа: gladiolus1136
0

а9=а6+а12/2=17+47=64/2=32

d=а9-а6/3=32-17=15/3=5

а1=-8

gladiolus1136: Прогрессия по формулам делается
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