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根據百分率找數量（一）: 例3的副本
Author:
冯圣军
,
GeoGebra Institute of Hong Kong
GeoGebra
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錐體建築師
画直线等分三角形的面积
柱體建築師
兩位數除以一位數（二）
兩位數加法
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園內接三角形
翻轉方塊(單開)
Beemo
Problem1:(md+me+mf)/(ad+be+cf)=a
复数的模 计算 自动批改
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Cone
Normal Distribution
Integral Calculus
Standard Deviation
Orthocenter