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根據百分率找數量（一）: 例4的副本
Author:
冯圣军
,
GeoGebra Institute of Hong Kong
GeoGebra
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兩組對邊相等的四邊形
画直线等分三角形的面积
兩位數除以一位數（一）
判斷球體
四邉形 (四年級) 教師版
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直線與圓的位置關係
正整數的指數律練習
包絡線
错觉多边形
椭圆滚动
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Stochastic Process or Random Process
Expected Value
Quadrilaterals
Multiplication
Limits