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Orthocentre

Author:Big Lee

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拼砌四邊形
【案例】2018年全国1卷理科12题
異分母分數減法
兩組對邊相等和有直角的四邊形
三位數除以一位數（一）

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Where is Micky?
認識線型函數關係式與圖形
材料
兩圓位置關係及公切線
谢氏地毯

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Trigonometric Functions
Straight Lines
Arithmetic Mean
Linear Equations
Geometric Transformations

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