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chen mingchuan
GeoGebra
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【案例】2013年安徽高考15题
判斷球體
兩位數加法
錐體建築師
算柱 (兩位數)
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gjh-h01-01 畢氏數三角形
國旗
艾雪鑲嵌
線的面畫
三角形重心的变化.许兴华数学
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Functions
Difference and Slope
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