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蝴蝶定理（唐老师的课程）
Author:
龚洪萍
Topic:
Algebra
,
Geometry
GeoGebra
New Resources
第八周作业
【案例】圆柱体内放置一个大球六个小球
【案例】2018年全国1卷理科12题
空间中两直线的位置关系
探究三角形的全等條件
Discover Resources
共垂心
尤拉線
熊大
旁心
椭圆内切圆链
Discover Topics
Percentages
Surface
Arithmetic
Cone
Parametric Curves