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折叠问题一例
Author:
孟宝兴
GeoGebra
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三位數除以一位數（一）
兩組對邊相等的四邊形
【案例】2018年全国1卷理科12题
畫出對稱圖形
四邉形 (四年級) 教師版
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三角形的邊長關係
三角函數伸縮與平移
九點圓
放射狀旋轉圖形(1)
線的面畫
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Expected Value
Solids or 3D Shapes
Equilateral Triangles
Inequalities
Conditional Probability