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正方形与内外弦图
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GeoGebra
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【案例】2013年安徽高考15题
找出對稱軸
三位數除以一位數（二）
柱體建築師
兩組對邊相等和有直角的四邊形
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凸透鏡成像
交集与并集的动态展示
橢圓軌跡
justin0704
海螺
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Sphere
Integral Calculus
General Quadrilateral
Sequences and Series
Step Functions