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S0E7
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GeoGebra
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龙形曲线-分形龙
异形操场
斐波那契螺旋弧线（表格法-可动态调节）
盈利與虧蝕
常见四边形是否是双心四边形
Discover Resources
Constructing Quadrilaterals by Four Sides (2014)
左右
Parameter
拋物線1--焦點法
圓周公式應用題2的副本
Discover Topics
Upper and Lower Sum or Riemann Sum
Parabola
Rectangle
Incircle or Inscribed Circle
Similar Triangles