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Author:
chen mingchuan
GeoGebra
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【案例】2018年全国1卷理科12题
【案例】2013年安徽高考15题
兩組對邊相等和有直角的四邊形
判斷球體
兩位數除以一位數（二）
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Enneper's surface
MTH5151trytry
Copy of sin(x) 的函數圖形
Illusion-外凸的正方形
AMC
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Equilateral Triangles
Means
Parallelogram
Triangles
Ellipse