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Torus
Author:
Chenwei Chen
GeoGebra
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四邉形 (四年級) 教師版
兩位數除以一位數（一）
【案例】圆柱体内放置一个大球六个小球
判斷球體
兩組對邊相等的四邊形
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Quiz on Index Notation 指數記數法：測驗
菱形
gltcf 計算長方體對角線
熱帶魚 (顏色變更)楊靜宜
認識分數
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Integers
Sphere
Probability
Matrices
Fractions