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教学素材：椭圆与双曲线
Author:
清风拂琴，陌上花开
GeoGebra
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双心四边形
折扣
第八周作业3
龙形曲线-分形龙2
异形操场
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錯覺藝術
GGB DAY3
六年級 圓周
負指數的計算
鉛筆畫圓
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Probability
Logarithmic Functions
Line Segment
Numbers
Centroid or Barycenter