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勾股定理的证明：弦图面积平移法 的副本
Author:
刘护灵
GeoGebra
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异形操场
龙形曲线-分形龙2
平行線的判定
比較五件物件的重量
盈利與虧蝕
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test123
模擬3D---切割與展開
Graph of Quadratic Function 二次方程圖像
验证2
笛卡兒心臟線 的複本
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Incircle or Inscribed Circle
Multiplication
Special Points
Means
Line Segment