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根據百分率找數量（二）: 例1的副本
Author:
冯圣军
,
GeoGebra Institute of Hong Kong
GeoGebra
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生活中的平面圖形問題2
凹透镜
trigonometry
ghk99a29 扇形旋轉
梯形面積(求上底)
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Median Line
Natural Numbers
Tangent Line or Tangent
Standard Deviation
Hypergeometric Distribution