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鉛筆的長度

Author:GeoGebra Institute of Hong Kong

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三位數除以一位數（二）
兩組對邊相等和有直角的四邊形
三位數除以一位數（一）
找出對稱軸
拼砌四邊形

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根據百分率找數量（二）: 例2
P4周界
密铺图形
人生宇宙
My First GGBBook

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Optimization Problems
Probability
Means
Logic
Parallelogram

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