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圓錐曲線的光學性質
Author:
陳隆期
GeoGebra
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拼砌四邊形
錐體建築師
兩組對邊相等的四邊形
找出對稱軸
球体的体积推导（优化版）
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Construct a regular pentagon
Scientific Notation 科學記數法
Book10-Unit7-拼出平行四邊形
認識分數
S7G1 模拟光的折射
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Similarity Transformation or Similarity
Numbers
Area
Combinatorics
Congruence