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蝴蝶定理證明2：綜合法
Author:
連琨銘
GeoGebra
New Resources
找出對稱軸
柱體建築師
【案例】2018年全国1卷理科12题
兩組對邊相等的四邊形
兩位數除以一位數（二）
Discover Resources
Angle Sum in a Triangle
moon1
多重刻度磅
圓錐截痕模型
约瑟夫问题
Discover Topics
Differential Equation
Logarithm
Secant Line or Secant
Integers
Intersection