Предмет: Математика, автор: Аноним

Сколько цифр понадобится для записи всех натуральных чисел от 1 до 99 включительно?

Ответы

Автор ответа: People6

189. От 1 до 9 понадобится 9. Потом идут двузначные, их 90 (99-9). В одном двузначном 2 цифры, а значит 90*2=180. И 180+9=189

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