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跑馬燈
Author:
chen mingchuan
GeoGebra
New Resources
球体的体积推导
兩位數除以一位數（二）
異分母分數減法
畫出對稱圖形
画直线等分三角形的面积
Discover Resources
西姆松定理推廣(西姆松圓)
學習單：平行四邊形面積
Gauss Seidel 線性迭代求解
纏繞畫1
三角形的內心
Discover Topics
Translation
Intersection
Centroid or Barycenter
Mathematics
Algebra