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Author:
黃斌
GeoGebra
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兩位數除以一位數（二）
球体的体积推导
錐體建築師
三位數除以一位數（一）
判斷球體
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圓錐曲線---拋物線
三角形中位線
http://www.qsir.org/?p=8853
重心三等分三角形
纏繞圖
彩色立体方阵、点阵
Discover Topics
Triangles
Circumcircle or Circumscribed Circle
Tree Diagrams
Differential Calculus
Tangent Line or Tangent