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B4 4-1 平行線性質
Author:
AlexWang
GeoGebra
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【案例】圆柱体内放置一个大球六个小球
球體建築師
三位數除以一位數（二）
畫出對稱圖形
算柱 (兩位數)
Discover Resources
五星形的頂角
Angle at Centre
test04
Orthographic views example
regtrg
Discover Topics
Similar Triangles
Statistical Characteristics
Congruence
Reflection
Logarithmic Functions