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教学素材：椭圆离心率
Author:
清风拂琴，陌上花开
GeoGebra
New Resources
科氏力 (Coriolis Force)
龙形曲线-分形龙
科赫雪花
斐波那契螺旋弧线（表格法）
常见四边形是否是双心四边形
Discover Resources
carrito
地球20160328
圓內兩半圓相切問題
空白範本
congruent triangle_provided by Mr Yeung Kar Chun
Discover Topics
Integers
Mathematics
Line Segment
Circle
Inequalities