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向量点乘
Author:
huhai463127310
GeoGebra
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判斷球體
画直线等分三角形的面积
三位數除以一位數（二）
【案例】2013年安徽高考15题
球体的体积推导
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軌跡觀察---兩圓上線段中點
shuipen
與兩圓相切之圓心雙曲線軌跡
圓外切四邊形
金惠吉：正弦交流电演示
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Incircle or Inscribed Circle
Rectangle
Conic Sections
Derivative
Trapezoid