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折扣 例5的副本
Author:
冯圣军
,
GeoGebra Institute of Hong Kong
GeoGebra
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拼砌四邊形
四邉形 (四年級) 教師版
兩位數除以一位數（二）
判斷球體
球體建築師
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JS 測試檔
task6
畢氏定理
梯形面積(求上底)
画直线等分三角形的面积
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Similar Triangles
Percentages
Expected Value
Angles
Matrices