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Author:
少平 朱
GeoGebra
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圓的切線方程
平行線的判定
科赫雪花
常见四边形是否是双心四边形
第三周作业效果演示
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初三奥赛：圆的切割线问题
冷氣機的銷量
六年級
橢圓3--平行四邊形法
初中几何证明
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Area
Special Points
Vectors 3D (Three-Dimensional)
Geometric Transformations
Derivative