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双动点变速运动
Author:
陈铁成
GeoGebra
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兩位數加法
兩組對邊相等和有直角的四邊形
兩位數除以一位數（二）
找出對稱軸
四邊形的特性
Discover Resources
拿破崙三角形
Why same areas?
旋轉扇形
拋物線1-焦點法
祖暅原理
Discover Topics
Terms
General Quadrilateral
Similarity Transformation or Similarity
Curve Sketching
Symmetry