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平行線法
Author:
chen mingchuan
GeoGebra
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兩位數除以一位數（一）
球體建築師
【案例】2013年安徽高考15题
【案例】2018年全国1卷理科12题
畫出對稱圖形
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二次函數
兩圓的公切線
圓點線
試算表2
三角形三边关系探究习题
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Parallelogram
LCM and GCD
Curve Sketching
General Quadrilateral
Piecewise Functions