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圓相切
Author:
一路梁
圓相切
GeoGebra
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AI 訓練教室
算柱 (兩位數)
畫出對稱圖形
小数 的副本
美國國旗 (Codex 版)
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不規則區域著色
number line
角的認識
定周长的正多边形面积变化规律（含圆）
小车
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Numbers
Tangent Line or Tangent
Line Segment
Polygons
Ratios