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Author:
余銘芬
GeoGebra
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sanjiaohanshu
拼砌四邊形
【案例】2018年全国1卷理科12题
兩組對邊相等的四邊形
錐體建築師
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求 a + b 的最大值?
square and circle
密铺图形
圓錐的曲面面積的副本
翻牌游戏中的数学道理
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Addition
Surface
Cone
Kite
Orthocenter