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数学勾股定理
Author:
xuhao
GeoGebra
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常见四边形是否是双心四边形
平行線的斜率
三角函数 的副本
百分數及其應用
祖冲之的期望:内棋与外棋
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折扣 例3
GGBScript
Trianglar prism
正n邊形與圓上點的中點軌跡(解析)
All in one (Centres of triangle)
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Hyperbola
Square
Probability
Limits
Straight Lines