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Author:
markfang
GeoGebra
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双心四边形
直線的斜率
三角函数 的副本
盈利與虧蝕
撒针估算面积实验
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勝者即正義，可愛即正義～(可用Ctrl+滑鼠滾輪放大界面)
畢氏定理
移項法則
含参的分段函数的单调性问题
多普勒效应动态演示
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Area
Parabola
Tangent Function
Definite Integral
Linear Functions