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Concave lens light bending
Author:
Tsui Hok
GeoGebra
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活动三：应用性质
常见四边形是否是双心四边形
盈利與虧蝕
平行線的判定
龙形曲线-分形龙
Discover Resources
中國火柴遊戲一
費氏螺旋線
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橢圓的副本
Choikou 5階
Discover Topics
Exponent
Set Theory
Interest Calculation
Rhombus
Cylinder