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Author:
黃斌
GeoGebra
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垂直線的斜率
双心四边形
【案例】2013年安徽高考15题
【案例】圆柱体内放置一个大球六个小球
平行線的斜率
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線對稱圖形練習1
國旗
mooc第四讲作业单晨
微信公众号“sx880A8”第253期摩纳哥亚国旗(flag of monaco)
「相似三角形」任务4的副本
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Conditional Probability
Tangent Function
Combinatorics
Differential Equation
Vectors 3D (Three-Dimensional)