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元旦快乐（制作：孟宝兴）
Author:
孟宝兴
GeoGebra
New Resources
異分母分數減法
兩位數加法
画直线等分三角形的面积
球體建築師
【案例】2013年安徽高考15题
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圖三
PreEnigma-1
高中, 直線與點對稱
amoeba
언제부터인지 몰르겟는데 ..
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Complex Numbers
Parabola
Hypergeometric Distribution
Real Numbers
Cylinder