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翰林數學_2下_CH3-1_多邊形的內角和
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翰林數學
GeoGebra
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畫出對稱圖形
拼砌四邊形
算柱 (兩位數)
兩組對邊相等和有直角的四邊形
三位數除以一位數（一）
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兩個圓的中點軌跡
Why same areas?
圖B
探索“三等分点连线围成的小三角形”的特点
S3 Inequality
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Surface
Line Segment
Quadratic Functions
Kite
Combinatorics