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y=ax^2（2）
Author:
陈丽婷
GeoGebra
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【案例】2013年安徽高考15题
平行線的斜率
空间中两直线的位置关系
祖冲之的期望：内棋与外棋
球体的体积推导（优化版）
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三角形外角和
工作天時
題二
Activity 2
Copy of 釘點紙畫三角形
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Vectors 3D (Three-Dimensional)
Right Triangles
Hypothesis Testing
Solids or 3D Shapes
Geometric Transformations