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正三角形堆垛
Author:
施奕瑄
GeoGebra
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異分母分數減法
【案例】2013年安徽高考15题
兩組對邊相等的四邊形
【案例】圆柱体内放置一个大球六个小球
画直线等分三角形的面积
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试卷讲评
五形面體 序
justin sin
鉛筆畫圓
線的面化
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Calculus
Differential Calculus
Circle
Logarithmic Functions
Set Theory