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几何模版：构造全等三角形证明线段相等
Author:
lansesorry
GeoGebra
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异形操场
科赫雪花
第八周作业1
第八周作业3
第三周作业效果演示
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例題6
circle1
畢氏定理的證明(三移動)
電工機械及基本電學圖解
gjh-g03-00 和的平方公式的副本
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Tangent Line or Tangent
Coordinates
Cosine
Orthocenter
Matrices