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正方形推垛
Author:
施奕瑄
GeoGebra
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【案例】2018年全国1卷理科12题
兩組對邊相等和有直角的四邊形
異分母分數減法
兩位數除以一位數（二）
四邉形 (四年級) 教師版
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task2
極線對偶定理 / polar duality theorem
空間畢氏定理
三角函數圖形（全）的副本
抛物线定义
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Sequences and Series
Calculus
Special Points
Exponential Functions
Reflection