kraiukhin: (Default)
kraiukhin ([personal profile] kraiukhin) wrote2011-12-30 10:31 am

Задачка

Журнал «Квант», № 1, 1970 год

Ответ здесь



Опубликовано в автономном блоге "Записки Дмитрия Краюхина".

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