Предмет: Математика, автор: oktom

Ребята, помогите, пожалуйста решить уравнение:

Приложения:

oktom: умножение

Ответы

Автор ответа: mostvit

0

Ответ:

Пошаговое объяснение:

Приложения:

oktom: Подскажите, где можно найти формулы n-го произведения? И почему при n=13 х=14, по логике х должен быть 15. Спасибо"!

mostvit: Извините за описку. Конечно х=15. Формула n-ого произведения выводится следующим образом: пусть первый член будет 1-1/a²=(a²-1)/a²=(a+1)(a-1)/a². Тогда второй член (а+2)а/(а+1)². Их произведение П1=(а-1)/а × (а+2)/(а+1). Продолжая таким же образом, получим П2=(а-1)/а × (а+3)/(а+2); П3=(а-1)/а × (а+4)/(а+3)... Пn=1/2 × (2+n+1)/(2+n)=(3+n)/(4+2n)

oktom: Спасибо большее!!!!!!

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