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六角形(草稿)
Author:
葉千岱
GeoGebra
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兩位數加法
錐體建築師
柱體建築師
兩組對邊相等的四邊形
四邊形的特性
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三角形重心(相關說明)
橢圓軌跡
二元一次方程式1
angle between 2 planes 01
图中的三角形面积何时最小?(许兴华数学)
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Derivative
Rectangle
Equations
Line Segment
Prism