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23平行线周长正方形
Author:
万超杰
GeoGebra
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判斷球體
畫出對稱圖形
四邉形 (四年級) 教師版
兩位數除以一位數（二）
兩組對邊相等和有直角的四邊形
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兩個圓的中點軌跡
Normal dist. (常態分布互動ggb)
Question 2
Angles in a Circle:Property 3
线性规划
Discover Topics
Planes
Tree Diagrams
Statistical Characteristics
Multiplication
Rhombus