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waaachen
Author:
陳兪宏
小手解答版!!!!
GeoGebra
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三位數除以一位數（二）
錐體建築師
兩位數除以一位數（二）
兩組對邊相等的四邊形
拼砌四邊形
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題九
slide base
奈格爾點
弧長與圓周角成比例
带电粒子——旋转圆
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Mathematics
Probability
Symmetry
Scalene Triangles
Calculus