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mooc第五讲作业单晨制作
Author:
单晨
GeoGebra
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畫出對稱圖形
算柱 (兩位數)
兩位數除以一位數（二）
四邊形的特性
sanjiaohanshu
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橢圓練習
Copy of gjc091b18 圓的割線
纏繞畫
Copia de Fractal Spirograph (Fractal Roulette)
常见四边形是否是双心四边形
Discover Topics
Incircle or Inscribed Circle
Vectors
Hyperbola
Similar Triangles
Means