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平行3
Author:
Hui Sir
GeoGebra
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兩組對邊相等和有直角的四邊形
三位數除以一位數（二）
判斷球體
【案例】2013年安徽高考15题
四邉形 (四年級) 教師版
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labyrinth
複合圖形(二)
Investigation on definite integral
內擺線
植树问题
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Percentages
Constructions
Derivative
Trigonometric Functions
Intersection