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平面向量基本定理
Author:
孟宝兴
GeoGebra
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兩組對邊相等和有直角的四邊形
球体的体积推导（优化版）
四邉形 (四年級) 教師版
柱體建築師
球体的体积推导
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圓面積的展開
EX3.18
有趣的軌跡圖
一年級
Angle of elevation and Angle of depression(仰角和俯角)
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Straight Lines
Tangent Line or Tangent
Expected Value
Percentages
Diagrams