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错觉图形-若隐若现的黑点
Author:
马宁
GeoGebra
New Resources
祖冲之的期望：内棋与外棋
兩位數除以一位數（一）
兩位數除以一位數（二）
球体的体积推导（优化版）
直線的斜率
Discover Resources
平移旋轉對稱
Positive angles & Negative angles
Name the prism 1
Witch of Agnesi
刘校安排（1）
Discover Topics
Arithmetic Mean
Circle
Vectors 3D (Three-Dimensional)
Tangent Line or Tangent
Reflection