数学之美

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Образ жизни Игры Гонки Развлечения Обучающие Головоломки
Разработчик Changjie Yan

0.99 USD

Often arithmetic has a strong effect on the intelligence of a person.;
Essential artifact for brain workers.
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Introduction:
1 timing arithmetic calculation, on one digit or number is calculated
2 time to answer each question
3 answer hints