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根據百分率找數量（二）: 例3
Author:
GeoGebra Institute of Hong Kong
Topic:
Percentages
GeoGebra
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畫出對稱圖形
拼砌四邊形
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平行四邊形與菱形的分別
龍騰4_1-1習6-2
PMC 2014-15 Q1
會動的函數圖形
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