Предмет: Алгебра, автор: Markos14

Найти 5-ый член арифметической прогрессии,если среднее арифметическое первых девяти ее членов равно 26.
Спасибо!

Ответы

Автор ответа: Сюррикен

0

Если среднее арифметическое крайних чисел последовательности равно 26, то и арифметическое чисел 4 и 6 также равно 26. А это и есть 5 член данной прогрессии.
Ответ: 26.

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