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Author:
李春培
I love you
GeoGebra
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拼砌四邊形
【案例】2013年安徽高考15题
判斷球體
四邉形 (四年級) 教師版
兩組對邊相等的四邊形
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怪函數之3
由線段與弧構成的封閉區域填色
log functions
活工(三)Q2
擲兩個硬幣的機率分布
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Trapezoid
Intersection
Addition
Mode
Set Theory