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正十二面體內接正四面體或內接正六面體
Author:
侯杰材
GeoGebra
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球体的体积推导（优化版）
【案例】圆柱体内放置一个大球六个小球
判斷球體
兩組對邊相等的四邊形
兩位數除以一位數（一）
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題 6
動畫
光的反射
y=Asin(ωx+φ)
兩組對邊相等和有直角的四邊形
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Hypergeometric Distribution
Orthocenter
Subtraction
Planes
Addition