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光在角内反射
Author:
海平 文
Topic:
Reflection
GeoGebra
New Resources
比較五件物件的重量
第八周作业2
折扣
盈利與虧蝕
龙形曲线-分形龙2
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star1
外心
同心六邊形
弹簧测力计
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Parametric Curves
Rectangle
Equilateral Triangles
Symmetry
Straight Lines