Предмет: Алгебра, автор: aaaaaaaaak

Знайти суму 10 членів арефметичної прогресії якщо а1=-7 , а10=82
А)75
Б)375
В)37.5
Г)365
Д)300

Ответы

Автор ответа: VikulkaShake
0

Ответ:

Сумма 10 членов арифметической прогрессии равна 375. Ответ: Б) 375.

Если не трудно отметь мой ответ лучшим.

Universalka: А где решение ?
VikulkaShake: были предоставлены варианты ответов, поэтому я не писала решение
Автор ответа: Universalka
0

a_{1}=-7\\\\a_{10}=82\\\\S_{10}=\frac{a_{1}+a_{10}}{2}*10=(-7+82)*5=375\\\\Otvet:\boxed{S_{10}=375}

belarusba11: Привет поможешь в тригонометрических функциях? Срочно нужно) Заранее спасибо. я задание опубликовал вчера, не знаю видно оно или нет.
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