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凸透镜成像
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cjy
GeoGebra
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祖冲之的期望:内棋与外棋
【案例】2013年安徽高考15题
圓周公式的應用
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Solar System
選修數學
双曲椭圆
圆的面积展开的副本
三角形分形
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Statistical Characteristics
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Polynomial Functions
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