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勾股定理的注水法证明（刘护灵）
Author:
刘护灵
GeoGebra
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直線的斜率
漂亮的摇摆曲线
空间中两直线的位置关系
球体的体积推导（优化版）
圓周公式的應用
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百分數（小學）：折扣 / 賺賠
動態比大小
Projection of vector in R2
分段移動
堆疊正立方體 的複本
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Normal Distribution
Trigonometry
Integers
Differential Equation
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