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轨迹20
Author:
万超杰
GeoGebra
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漂亮的摇摆曲线
垂直線的斜率
【案例】圆柱体内放置一个大球六个小球
双心四边形
球体的体积推导
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傅立葉級數
費爾巴哈(Feuerbach)定理
轴对称
BkD_act15_04c
我的第一个GGB绘本
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Scalene Triangles
Equations
Ellipse
Tangent Line or Tangent
Pyramid