Предмет: Математика, автор: pobegarmia

70 баллов!!! Найди сумму первых 4 членов геометрической прогрессии, если b1 = 6 и q= 2.

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Автор ответа: murkins

Можно сделать двумя способами, решение внизу:
Ответ : 90

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