С Денём рождения! Поздравление участников
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![[Думайте, Сэр!] Как быстро считать в уме. Быстрее калькулятора. Ментальная арифметика отдыхает.](https://sun9-76.userapi.com/impg/wq2-ChElaFjuakczhU90FMCpcEjdPwKPmgZ5qQ/RulvjovAtiU.jpg?size=320x240&quality=95&keep_aspect_ratio=1&background=000000&sign=d8c20079b016dacd6e589d764ee08ac5&c_uniq_tag=cdNCuxVvaeq3kYVqa-avx4ewyLGYKwTKTvsadNs1J98&type=video_thumb)
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