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小一時鐘小幫手 2023
Author:
Chan Pui Chuen
GeoGebra
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垂直線的斜率
平行線的斜率
比較五件物件的重量
圓的基本性質
祖冲之的期望:内棋与外棋
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winter vacation homework 3
平移動畫(平移加滑桿)
Protractor-usage
全等三角形
球表面积的一种特殊推导