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根據百分率找數量（二）: 例3的副本
Author:
冯圣军
,
GeoGebra Institute of Hong Kong
GeoGebra
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直角坐標平面上的旋轉變換
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算柱 (兩位數)
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摩天輪
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日照图
複數乘法的幾何意義
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Poisson Distribution
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