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parallelogram and squares
Author:
johnmayhk
GeoGebra
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【案例】2018年全国1卷理科12题
四邉形 (四年級) 教師版
異分母分數減法
判斷球體
找出對稱軸
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將數列化為級數（文字）
雙曲線的定義
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Copy of 正方體的反射對稱1
圆锥曲线折纸操作题（教材案例）
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Binomial Distribution
Confidence Interval
Secant Line or Secant
Continuity
Straight Lines