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tan90

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【案例】2018年全国1卷理科12题
四邊形的特性
兩位數除以一位數（一）
異分母分數減法
兩位數除以一位數（二）

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複合圖形(一)
拼貼
以剪貼比較圖形大小題1的副本
HKMO 2008 Question 3 Demonstration (Geometric Construction)
立體圓錐與斜切面關係

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Functions
Square
Congruence
Integers
Difference and Slope

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