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六上练习：时钟轨迹问题
Author:
肖昆明
GeoGebra
New Resources
平行線的判定
龙形曲线-分形龙
比較五件物件的重量
撒针估算面积实验
盈利與虧蝕
Discover Resources
數值滑桿
Quiz on Special Lines in Triangles 三角形內的特殊線：測驗
thm 11,12
作業
双曲线交抛物线
Discover Topics
Orthocenter
Incircle or Inscribed Circle
Bar Chart or Bar Graph
Optimization Problems
Algebra