Предмет: Математика, автор: Позитиффно

Для нумерации страниц словаря потребовалось 207 цифр, нумерация начинается с первой страницы. Сколько страниц в книге?

Ответы

Автор ответа: Костяша
0

c 1 по 9 - 9*1=9 цифр

с 10 по 99 - 2*(99-9)=180 цифр

207-(9+180)=18 цивр

18/3=6 страниц

99+6=105 страниц в книге...

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