Предмет: Математика, автор: abror7426dom

В концертом зале 15 рядом Скольо раз используется число 9 в нумерации мест если в каждом ряду по 24 места?

Ответы

Автор ответа: sobolutcom183
3

Ответ:

42

Пошаговое объяснение:

Если правильно толковать задачу, то ЧИСЛО 9 встретится всего один раз, но я предполагаю что имелась ввиду ЦИФРА 9. для начала нужно найти сколько всего чисел используется в нумерации

Всего 15 рядов, в них по 24 места, тоесть 15*24 = 360 мест

цифра 9 используется в 9, 19, 29, 39, 49, 59, 69, 79, 89, 90, 99, 109, 119, 129, 139, 149, 159, 169, 179, 189, 190, 199, 209, 219, 229, 239, 249, 259, 269, 279, 289, 290, 299, 309, 319, 329, 339, 349, 359.

Подсчитывать нужно все цифры 9, где их в числе две, засчитывать за две:

42 раза используется цифра 9 для нумерации мест в концертном зале

azizazubaydullayeva0: а можно вкратце?
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