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复习勾股定理
Author:
wangjiezailai
GeoGebra
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异形操场
双心四边形
平行線的判定
百分數及其應用
龙形曲线-分形龙2
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公切線長度的計算
橢圓
馬字歌
圖解直式開方
探索三角形外角定理
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Statistics
Equilateral Triangles
Constructions
Addition
Angles