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20200329平面截圆锥
Author:
陈敦莹
GeoGebra
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折扣
盈利與虧蝕
圓的切線方程
第八周作业
三角函数 的副本
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圓錐曲線---橢圓
角平分線作圖1213
平行四邊形的組合
三節棍
彩色莫比乌斯环
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Parallelogram
Solids or 3D Shapes
Polygons
Logarithmic Functions
Plane Figures or Shapes