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根據百分率找數量（二）: 例3 的複本
Author:
Miss Tsang
,
GeoGebra Institute of Hong Kong
GeoGebra
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算柱 (兩位數)
sanjiaohanshu
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強森定理強森定理
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三節棍問題
Graph of Tangent
拋物線6--包絡線法
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