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高斯定理：對角線中點共線
Author:
羅驥韡 (Pegasus Roe)
GeoGebra
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兩位數加法
拼砌四邊形
【案例】2018年全国1卷理科12题
畫出對稱圖形
算柱 (兩位數)
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平行四邊形有甚麼特性？
線段前後分割
Ex5C#6
Copy of 正方体展开图
百度
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Sine
Frequency Distribution
Tangent Line or Tangent
Root
Translation