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詠甯
GeoGebra
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sanjiaohanshu
GeoGebra笔记功能体验课件
近似值：有效數字
兩位數加法
三位數除以一位數（一）
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百分數（小學）：折扣 / 賺賠（Java 版）
配方法 Completing the Square
五角錐體
Angle between 2 planes
我的第一个GGB绘本
Discover Topics
Normal Distribution
Quadratic Functions
Parallelogram
Geometric Transformations
Incircle or Inscribed Circle