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Meaning of dy/dx
Author:
johnmayhk
GeoGebra
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球体的体积推导
柱體建築師
三位數除以一位數（二）
【案例】圆柱体内放置一个大球六个小球
兩組對邊相等和有直角的四邊形
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Salaries Tax in Hong Kong 薪俸稅
找出圖形- T的周界
圓上的角任務(三): 同弓形內的圓周角
圓錐曲線
GeoGebra创建的小游戏集