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Author:
luodeqin@keleshuxue.com
GeoGebra
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兩組對邊相等和有直角的四邊形
異分母分數減法
兩位數除以一位數（一）
小数 的副本
三位數除以一位數（一）
Discover Resources
任務4
繞行
弦心距垂直平分弦
橢圓重心軌跡1
双曲线定义
Discover Topics
Fractions
Incircle or Inscribed Circle
Curve Sketching
Rhombus
Quadrilaterals