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圓周的計算
Author:
SIN MING WONG
GeoGebra
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判斷球體
兩組對邊相等的四邊形
【案例】2013年安徽高考15题
画直线等分三角形的面积
球體建築師
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waaachen
peacock3
数学教学新帮手
在釘點紙上畫垂直線
正弦公式1
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Expected Value
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