Пусть сторона куба при распиливании была разделена на х частей.
Тогда неокрашенных кубиков (внутренних) будет (х-2)^3, а число кубиков, у которой окрашена ровно одна грань (кубики на гранях большого, не прилежащие к ребрам) равно 6·(х-2)^2.
Получаем уравнение (x-2)^3 = 6·(x-2)^2 или x-2 = 6, x = 8
Куб распилили на 8^3 = 512 кубиков.
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Кубиков с 3 окрашенными гранями – 8
Кубиков с 2 окрашенными гранями – 6·12 = 72
Кубиков с 1 окрашенной гранью – 6·6·6 = 216
Неокрашенных кубиков – 6·6·6 = 216
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Поделитесь своими знаниями, ответьте на вопрос:
Докажите, что (10а+b)×11=100а+10(а+b)+b. используя данный результат, объясните, почему 35×11=385 (8=3+5), 75×11=825 (12=7+5