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数学之美


4.2 ( 912 ratings )
Yaşam Tarzı Oyunlar Yarış Eğlence Eğitici Bulmaca
Geliştirici: 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