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定长线段在相交直线上滑动
Author:
冯伟冀
GeoGebra
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三位數除以一位數（一）
GeoGebra笔记功能体验课件
錐體建築師
兩組對邊相等的四邊形
柱體建築師
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winter vacation homework 9
空間三角形面積
ghseh 二次函數上下y值差
找中點軌跡
Congruent and Similarity
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Incircle or Inscribed Circle
Arithmetic
Numbers
Polygons
Planes