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椭圆的定义
Author:
梁航宇
GeoGebra
New Resources
圓的切線方程
垂直線的斜率
正方形雪花图案
双心四边形
龙形曲线-分形龙
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An angle problem
CLOCK
thm 11,12
沈暐珊 橢圓反射
n星角 のコピー