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1982全国理7
Author:
常振虎
GeoGebra
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三位數除以一位數（一）
拼砌四邊形
球体的体积推导
錐體建築師
判斷球體
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animation for kastin
Copy of 部分佔全部的百分率: 例1
三角形移動多一格
No.3
二項分佈的副本
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Orthocenter
Sine
Translation
Congruence
Calculus