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九九乘法表的認識
Author:
鍾文欽
GeoGebra
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四邊形的特性
画直线等分三角形的面积
球体的体积推导（优化版）
第八周作业
錐體建築師
Discover Resources
Slope
Ex5C#6
對稱圖形
鉛筆畫圓
靜態幾何錯視圖
Discover Topics
Percentages
Mode
Arithmetic Operations
Difference and Slope
Orthocenter