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zentangle
Author:
陳隆期
GeoGebra
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兩位數加法
画直线等分三角形的面积
異分母分數減法
四邉形 (四年級) 教師版
直角坐標平面上的旋轉變換
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f(x)=ax^2
複數乘法的幾何意義
Angles in Alternate Segment
計算圖形周界(小六下)
乘法表的自动练习的副本
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Rectangle
Sphere
Differential Calculus
Confidence Interval
Root