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概率与频率关系
Author:
朱亮
GeoGebra
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拼砌四邊形
算柱 (兩位數)
四邊形的特性
球体的体积推导（优化版）
【案例】2013年安徽高考15题
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中心对称
立方體與平面截痕１
兩針夾角
拋物線與直線關係
Exploration of the conditions for congruent triangles.
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Optimization Problems
Quadratic Equations
Centroid or Barycenter
Root
Ellipse