Пётр Девятаев
Биография
Учитель математики АНО "Павловская гимназия"
Олимпиадные задачи. Математика. Часть 244
Олимпиадные задачи. Математика. Часть 297
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Олимпиадные задачи. Математика. Часть 241
Олимпиадные задачи. Математика. Часть 241
Олимпиадные задачи. Математика. Часть 238
Олимпиадные задачи. Математика. Часть 238