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椭圆内切圆链
Author:
孟宝兴
GeoGebra
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漂亮的摇摆曲线
球体的体积推导（优化版）
直線的斜率
圓的基本性質
【案例】2018年全国1卷理科12题
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弧度制的意义
小數
perimeter
第4課
指数函数的副本
Discover Topics
Trigonometric Functions
Centroid or Barycenter
Median Value
Numbers
Arithmetic