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yiu
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yiu
GeoGebra
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判斷球體
兩組對邊相等和有直角的四邊形
拼砌四邊形
兩位數加法
兩位數除以一位數(二)
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阿基米德(3,6,6)
ch14 p.30#31
分數認識
單向函數
摺長方形
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Addition
Linear Functions
Straight Lines
Tangent Function
Vectors 2D (Two-Dimensional)