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CIY
GeoGebra
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兩位數除以一位數（一）
畫出對稱圖形
找出對稱軸
異分母分數減法
四邉形 (四年級) 教師版
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時間參數跳躍函數與向量搭配
三角形的三角和及外心、內心圓
curve 函數的示範
shuangquxian
v型咖啡濾網
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Rhombus
Cylinder
Ellipse
Angles
Triangles