Предмет: Алгебра, автор: cepurnojvitalik00

Обчисліть суму п'ятнадцяти перших членів арифметичної прогресії, якщо її шостий член дорівнює 2,2 , а різниця дорівнює 2,4

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Автор ответа: kyrielets

Ответ:

-39..................

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