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luodeqin@keleshuxue.com
GeoGebra
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錐體建築師
球体的体积推导
球體建築師
【案例】2018年全国1卷理科12题
球体的体积推导（优化版）
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呼拉圈
平行四邊形
Properties of a Parallelogram
B4 4-1 平行線性質
椭圆的定义
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Quadratic Equations
Differential Calculus
Secant Line or Secant
Conic Sections
Similarity Transformation or Similarity