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gltyz 斜圓錐
Author:
均一
GeoGebra
New Resources
三位數除以一位數（二）
拼砌四邊形
兩組對邊相等的四邊形
四邉形 (四年級) 教師版
找出對稱軸
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交集与并集的动态展示
生活中的平面圖形─四邊形的性質
橢圓折痕
橢圓軌跡_過圓內一點與圓內切
数学几何
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Trapezoid
Calculus
Matrices
Hypothesis Testing
Centroid or Barycenter