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Author:
keith leung
,
Tim Brzezinski
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GeoGebra
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兩位數加法
拼砌四邊形
四邊形的特性
異分母分數減法
兩位數除以一位數（二）
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題 3
截面法體積(2)
函數分割逼近
周界-平移法(練習二)
三角形的面積
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Equilateral Triangles
Distributions
Combinatorics
Right Triangles
Diagrams