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三角形內心_不完美版
Author:
lihsing.zen
Topic:
Centroid or Barycenter
GeoGebra
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畫出對稱圖形
兩位數除以一位數（二）
【案例】2018年全国1卷理科12题
拼砌四邊形
錐體建築師
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圓錐截痕
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異分母分數加法
功課'
鸚鵡螺旋線
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Percentages
Polynomial Functions
Addition
Median Line
Set Theory