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任意三棱锥的外接球
Author:
孟宝兴
GeoGebra
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【案例】2018年全国1卷理科12题
兩位數加法
兩組對邊相等和有直角的四邊形
異分母分數減法
錐體建築師
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三角形數
翰林B4課p227_9
向量的分解（非垂直）
testing
兩圖形中點軌跡（1060724)
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Statistical Characteristics
Probability
Symmetry
Continuity
Rational Numbers