Предмет: Алгебра, автор: KeoMary

Проверьте, правильно ли я решила
Арифметическая прогрессия задана условием an=-11,9+7,8n найдите a11
Просто в это условие надо подставить вместо n 11 и решить?
у меня получилось 73,6

Ответы

Автор ответа: alxlie1999
1
да, ты правильно поняла, нужно подставить 11 вместо n 
a11=-11,9+7,8*11=-11,9+85,8=73,9
у меня вышло 73,9
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