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中線定理(阿波羅尼奧斯)定理推廣二：向四邊形推廣
Author:
連琨銘
GeoGebra
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三位數除以一位數（二）
兩組對邊相等的四邊形
【案例】圆柱体内放置一个大球六个小球
異分母分數減法
【案例】2018年全国1卷理科12题
Discover Resources
天干與地支
Quiz on Solving Right Triangles (Finding Angles) 解直角三角形：測驗2（求角度）
Similar triangles reasons
切線性質B
笛卡兒心臟線 的複本
Discover Topics
Differential Equation
Matrices
Curve Sketching
Natural Numbers
Secant Line or Secant