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错觉图形-外凸的四边形
Author:
马宁
GeoGebra
New Resources
平行線的斜率
直線的斜率
【案例】2013年安徽高考15题
兩位數除以一位數（二）
球体的体积推导
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waaachen
正五角錐(旋轉，實體、透視)
外接圓的心
完整地球儀
圓周和直徑(一)NEW
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Cone
Hyperbola
Quadrilaterals
Random Experiments
General Quadrilateral