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外心

Author:Bennie Liu

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三位數除以一位數（二）
兩組對邊相等和有直角的四邊形
拼砌四邊形
找出對稱軸
四邉形 (四年級) 教師版

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托勒密定理推廣到直線
congruent (AAA)
GGB5
【折纸】A4纸折四面体
科氏力 (Coriolis Force)

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Pyramid
Orthocenter
Random Experiments
Rational Numbers
Quadratic Equations

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