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五角星
Author:
min
GeoGebra
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錐體建築師
兩組對邊相等和有直角的四邊形
三位數除以一位數（一）
四邉形 (四年級) 教師版
拼砌四邊形
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行程圖 (Travel Graph)
圓形,三角形軌跡觀察
分段移動
p.8.18
表内除法
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Incircle or Inscribed Circle
Logarithmic Functions
Quadrilaterals
Circle
Diagrams