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Author:
洪馷孺
GeoGebra
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【案例】圆柱体内放置一个大球六个小球
畫出對稱圖形
直角坐標平面上的旋轉變換
兩位數除以一位數（二）
【案例】2013年安徽高考15题
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畢氏定理的證明
T7 geobra
Section Curves
正弦公式證明 (Mr. KONG)
If x^2 + x + k > 0 for any real value of x, what is k?
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Distributions
Rotation
Secant Line or Secant
Rhombus
Normal Distribution