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欧拉线与九点圆
Author:
吕胜
GeoGebra
New Resources
兩組對邊相等和有直角的四邊形
異分母分數減法
三位數除以一位數（二）
兩位數加法
兩位數除以一位數（一）
Discover Resources
Slope of a St. Line (formula)
圓上的角任務(一): 提示卡(三)
Quiz on Solving Quadratic Inequalities 解二次不等式：測驗 (v2018)
蝴蝶定理动态演示
sintx
Discover Topics
Tangent Line or Tangent
Volume
Vectors
Perimeter
Numbers