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happy new year
Author:
李春培
happy new year
GeoGebra
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四邉形 (四年級) 教師版
三位數除以一位數（二）
異分母分數減法
兩組對邊相等的四邊形
四邊形的特性
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gjh-a02-hippocrates 月牙
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畢氏定理證明
畫等腰直角三角形 題2
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Rational Numbers
Geometry
Differential Calculus
Set Theory
Equations