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Petlach Wave
Author:
魏向东
GeoGebra
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科赫雪花
折扣
双心四边形
斐波那契螺旋弧线（表格法-可动态调节）
活动三：应用性质
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Standard Deviation (one data set) 標準差（一組數據）
Angle between Line and Plane
Ex10.1 q13
七巧板
選修數學
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Division
Pyramid
Subtraction
Surface
Rhombus