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Author:
Lin Ching Chieh
GeoGebra
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三位數除以一位數（二）
兩組對邊相等和有直角的四邊形
兩位數除以一位數（一）
四邉形 (四年級) 教師版
畫出對稱圖形
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摸似利萨如图形
因數的判別
F2_Ch11.1_三角學(對鄰斜)
滑桿動畫示範-1
橢圓軌跡 (4)的副本
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Logarithm
Scalene Triangles
Area
Sphere
Circumcircle or Circumscribed Circle