Предмет: Математика, автор: 555Регина555

Пишутся одно за другим подряд все числа натурального ряда 123456789101112131415123456789101112131415... Какая цифра будет написана на четырёхсотом месте?

Ответы

Автор ответа: IrkaShevko

0

у нас есть
9 - однозначных чисел - это 9 цифр
90 двузначных - это 2*90 = 180 цифр

9+180 = 189 - цифр до трехзначных

400 - 189 = 211 - цифр от трехзначных числе

211 : 3 = 70 (ост.1)
значит искомая цифра - первая цифра 71-ого трехзначного числа (170), т.е. цифра 1

Ответ: 1

Автор ответа: Простоталантлива

0

у меня тот же ответ. Только нашла я его путем, который легче

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