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Author:李春培

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兩組對邊相等的四邊形
兩組對邊相等和有直角的四邊形
兩位數加法
四邉形 (四年級) 教師版
異分母分數減法

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Angle at Centre Twice Angle at Circumference
學資p.14第9題
整數除真分數
勝者即正義
平行四邊形面積

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Equations
Coordinates
Orthocenter
Diagrams
Tangent Function

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