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the definition of ellipse
Author:
丁明智
GeoGebra
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【案例】2018年全国1卷理科12题
【案例】圆柱体内放置一个大球六个小球
錐體建築師
異分母分數減法
兩位數加法
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分數減法
Is this a prism 8
Apollonius Problem 7 CCP Inversion simple 34
S5 Permutation and Combination
包絡線：雙曲線
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Parallelogram
Orthocenter
Rhombus
Constructions
Conic Sections