Предмет: Математика, автор: dimashosta

. В арифметичній прогресії (an) третій член дорівнює 20, різниця прогресії d = –3,2. Обчисліть суму перших шести членів цієї прогресії.

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Автор ответа: akka2887

43

Ответ:

Ответ данной задачи равен 110.4

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