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蝴蝶線 butterfly line
Author:
MathChou
Click "Run/Stop" button to try the move.
GeoGebra
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【案例】圆柱体内放置一个大球六个小球
四邉形 (四年級) 教師版
判斷球體
兩位數除以一位數（二）
兩位數加法
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基測試題旋轉
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Copy of 均分除法（分數÷整數）
中职数学
对多边形对角线、内角和、外角和的理解
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Means
Constructions
Geometric Mean
Inequalities
Surface