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mooc第四讲椭圆反射
Author:
单晨
GeoGebra
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科氏力 (Coriolis Force)
讀磅
双心四边形
撒针估算面积实验
直線的斜率
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Square pyramid
外公切線作圖
仙后座找北極星1
椭圆的一种简单画法.许兴华数学
抛物线定义
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Special Points
Straight Lines
Right Triangles
Congruence
Prism