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几何模版：线段关系练习
Author:
艳er
GeoGebra
New Resources
科氏力 (Coriolis Force)
双心四边形
龙形曲线-分形龙2
折扣
撒针估算面积实验
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重心性質
test
密铺图形
[洋葱] 费马点问题
根據百分率找數量（二）: 例3的副本
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Tangent Line or Tangent
Square
Triangles
Symmetry
Ellipse