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fchengang动画
Author:
符成岗
GeoGebra
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第八周作业1
三角函数 的副本
龙形曲线-分形龙2
盈利與虧蝕
龙形曲线-分形龙
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解題的結果
grass eating
滚动的石头
倍长中线以及一线三等角的应用
正方体镂空模型（通用）
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Limits
Rectangle
Plane Figures or Shapes
Trigonometry
Parabola