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星罗棋布
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GeoGebra
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圓的基本性質
科赫雪花
圓的切線方程
平行線的判定
活动三：应用性质
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聖路易拱門
齊找對稱軸
兩位數除兩位數(例子二)
高中物理·小船过河问题
动态展开圆柱体
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Means
Equations
Perimeter
Definite Integral
LCM and GCD