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二次函数定义
Author:
何嘉驹
GeoGebra
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中华人民共和国国旗
活动三：应用性质
龙形曲线-分形龙2
平行線的判定
撒针估算面积实验
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畫三角形 題2a
畢氏定理
太极图
傅里叶级数 Fourier series
ω的影响
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Circle
Orthocenter
Similar Triangles
Polygons
Centroid or Barycenter