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the definition of ellipse
Author:
丁明智
GeoGebra
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直線的斜率
垂直線的斜率
【案例】2013年安徽高考15题
画直线等分三角形的面积
兩位數除以一位數（二）
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雙曲線的軌跡
soccer
chapter1
複合圖形體積(三角形與四邊形結合)
极坐标
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Tangent Line or Tangent
LCM and GCD
Similar Triangles
Conic Sections
Orthocenter