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Автор - alenaromanova3

вычислите а7 если а1=-4 d=-2

Ответ

Автор - armochka99
Решение:

a_n=a1+d(n-1)
a^7=a^1+6d
a^7=-4+(-12)
a^7=-16

Ответ:a^7=-16

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