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全等中一线三等角
Author:
数豆豆
GeoGebra
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画直线等分三角形的面积
兩位數除以一位數（一）
異分母分數減法
球体的体积推导（优化版）
兩組對邊相等和有直角的四邊形
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倍數的判別
畫圓
費爾巴哈(Feuerbach)定理
量角器
How to draw a decagon with ruler and compasses?
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Inequalities
Plane Figures or Shapes
Reflection
Cube
Equilateral Triangles