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dora
GeoGebra
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球体的体积推导
圓的切線方程
平行線的斜率
球体的体积推导(优化版)
【案例】2013年安徽高考15题
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方格紙上畫正方形4
托勒密定理
我的傑作6C04
畢氏定理
拋物線4--平行四邊形法
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Congruence
Planes
Set Theory
Straight Lines
Means