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2018东莞面积动画
Author:
靳道阳
GeoGebra
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双心四边形
平行線的斜率
球体的体积推导（优化版）
【案例】2018年全国1卷理科12题
祖冲之的期望：内棋与外棋
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切線段等長
等分例子
均分
黎曼和的副本
v型咖啡濾網
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Planes
Scatter Plot
Subtraction
Fractions
Curve Sketching