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根據百分率找數量（二）: 例4的副本
Author:
冯圣军
,
GeoGebra Institute of Hong Kong
GeoGebra
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美國國旗 (Codex 版)
Earth with coastline
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涌动
平行四邊形柱展開
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三平面關係 的複本
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Set Theory
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Vectors 2D (Two-Dimensional)
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