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学用数学
GeoGebra
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兩組對邊相等的四邊形
【案例】2013年安徽高考15题
画直线等分三角形的面积
四邊形的特性
球体的体积推导(优化版)
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正三角形的旋轉2
捷徑
厘米和毫米
奈格爾點與葛爾崗點互為等距共軛點
congruent (SSS) 2
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Set Theory
Inequalities
Translation
Plane Figures or Shapes
Derivative