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封閉區域填色
Author:
葉冠和
GeoGebra
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四邉形 (四年級) 教師版
異分母分數減法
兩位數加法
兩位數除以一位數（一）
找出對稱軸
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拼出三角形
四邊形的「等角分點」的副本
Graph of tangent
七巧板
橢圓P176例11
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Variance
Multiplication
Trapezoid
Vectors 2D (Two-Dimensional)
Fractal Geometry