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優良作品1
Author:
Ching-Hui Chou
GeoGebra
New Resources
双心四边形
异形操场
龙形曲线-分形龙2
三角函数 的副本
平行線的判定
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正八面體
空間中的平面與直線
七巧板
尺规作图
初三第十五讲真卷4-23题
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Scalene Triangles
Geometric Mean
Equilateral Triangles
Geometric Transformations
Set Theory