Предмет: Математика, автор: madina170906

Помогите подробно решить. В книге 120 страниц. Сколько цифр напечатали для нумерации страниц начиная с третьей страницы?

Ответы

Автор ответа: тынешаришь

0

ну смотри, если 120 страниц, заначит по две нумерации (будем так говорить) на страницу, значит всего-240...
убираем 1-ю страницу- -2 нумерации.. .
убираем 2-ю страницу- -2нумерации. .
240-4=236 получается
Вот и всё это и не так уж и сложно

Автор ответа: enyrbibi

0

9+90×2+21×3=252 правильно

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