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餘弦定理的圖形證明2
Author:
yuchengda
GeoGebra
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兩位數除以一位數（一）
錐體建築師
【案例】2013年安徽高考15题
拼砌四邊形
【案例】圆柱体内放置一个大球六个小球
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三棱锥的体积推导
幾何變換
畢氏定理的證明(三移動)
exp. functions
S3 Ch4.3 例4.6b 三視圖(3D圖)
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Vectors 2D (Two-Dimensional)
Tree Diagrams
Parallelogram
Logarithm
Isosceles Triangles