由全国数学教师委员会创建，这个网站帮助家庭享受校外通过一系列生动有趣的数学挑战。
Created by the National Council of Teachers of mathematics, this site helps families enjoy mathematics outside school through a series of fun and engaging challenges.
由全国数学教师委员会创建，这个网站帮助家庭享受校外通过一系列生动有趣的数学挑战。
Created by the National Council of Teachers of mathematics, this site helps families enjoy mathematics outside school through a series of fun and engaging challenges.
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