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wangjiezailai
GeoGebra
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平行線的判定
双心四边形
龙形曲线-分形龙
常见四边形是否是双心四边形
盈利與虧蝕
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Field function 展示
坐标变换
gyzpa 拋物面鏡的反射
两点电荷连线上电势的分布曲线（2017江苏高考题）
二次函数随参数a,b,c的变化而变化.许兴华数学
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Translation
Means
Addition
Triangles
Trigonometric Functions