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许业成
GeoGebra
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GeoGebra数学资源(4-8年级)
异形操场
平行線的判定
中华人民共和国国旗
龙形曲线-分形龙2
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waaachen
相似形縮放
数学教学新帮手
劉虹圻 旁心
点、线、角
Discover Topics
Area
Statistical Characteristics
Logarithmic Functions
Conic Sections
Triangles