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Author:
chen mingchuan
GeoGebra
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兩位數加法
三位數除以一位數（一）
第八周作业
兩組對邊相等和有直角的四邊形
算柱 (兩位數)
Discover Resources
角平分線
正方形與正三角形
GGB5_3D:展開圖
認識函數值(隨機出題)
-1/8 ≤ cosα cosβ cosγ ≤ 1
一个三棱锥的绘图案例
Discover Topics
Cuboid
Centroid or Barycenter
Division
Continuity
Cone