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上和與下和
Author:
yuchengda
Topic:
Geometry
GeoGebra
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讀磅
垂直線的斜率
探究三角形的全等條件
平行線的斜率
球体的体积推导（优化版）
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根據百分率找數量（二）: 例2
特別角的三角函數值(2)
軌跡
圖二 的複本
平分线段或角
Discover Topics
Limits
Solids or 3D Shapes
Right Triangles
Normal Distribution
Similarity Transformation or Similarity