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多边形旋
Author:
赵林
GeoGebra
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【案例】2018年全国1卷理科12题
判斷球體
兩位數除以一位數（一）
四邉形 (四年級) 教師版
錐體建築師
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一階導函數
生活
Möbius strip
How to draw an ennegon with ruler and compasses?
指考題 正六邊形向量組合
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Means
Parametric Curves
Arithmetic
Division
Histogram