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（二）认识三角形和四边形
Author:
玖玖
GeoGebra
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活动三：应用性质
圓的基本性質
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龙形曲线-分形龙2
平行線的判定
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全等三角形: 重溫
數學操作課程_20150920
Apollonius Problem 7 CCP Inversion 12
正方形堆垛
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Stochastic Process or Random Process
Linear Regression
Fractal Geometry
Multiplication
Integral Calculus