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植樹問題（小四至小六）
Author:
maths.ephhk
GeoGebra
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常见四边形是否是双心四边形
平行線的斜率
斜率的值
球体的体积推导（优化版）
垂直線的斜率
Discover Resources
Locus
函數的切線
滾出直線之3
三角形外心探討
滑桿動態指令(動畫根本指令)
Discover Topics
Dilation
Variance
Parabola
Similar Triangles
Root