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甚麼是球體
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GeoGebra
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異分母分數減法
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（二）
畫出對稱圖形
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waaachen
填滿與旋轉
數學傳播39卷4期, 平面幾何公式思考
string art
圆形磁场
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Confidence Interval
Prism
Frequency Distribution
Power Functions
Kite