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龍騰4_1-1課隨1
Author:
廖傑成
GeoGebra
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畫出對稱圖形
三位數除以一位數（一）
兩位數加法
四邊形的特性
兩組對邊相等的四邊形
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color
test
外心
maths1
比例中的定值問題(三)
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Orthocenter
Conic Sections
Planes
Calculus
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