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Author:
军云
GeoGebra
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龙形曲线-分形龙
异形操场
活动三：应用性质
平行線的判定
斐波那契螺旋弧线（表格法-可动态调节）
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畫三角形 題2b
ghseh 二次函數描點法頂點法-4
Trigonometric Identities
分數比較
圆周率π的收敛极快算法（代数几何方法）
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Diagrams
General Quadrilateral
Parallelogram
Addition
Equilateral Triangles