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chen mingchuan
GeoGebra
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四邉形 (四年級) 教師版
三位數除以一位數（一）
錐體建築師
算柱 (兩位數)
兩位數除以一位數（一）
Discover Resources
弧度
鏡面反射光線
Mobius 變換 (2)
選擇合適的「中間人」
四邊形特性
Discover Topics
Hypothesis Testing
Upper and Lower Sum or Riemann Sum
Terms
Centroid or Barycenter
Plane Figures or Shapes