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1977北京文7
Author:
常振虎
GeoGebra
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找出對稱軸
兩位數加法
球体的体积推导（优化版）
【案例】2013年安徽高考15题
球体的体积推导
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線性組合2 三角形
congruent (SSA,RHS)
橢圓3-平行四邊形法
二倍角的正切公式的证明
圆的有关概念
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Vectors 3D (Three-Dimensional)
General Quadrilateral
Line Segment
Stochastic Process or Random Process
Tangent Function