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GeoGebra
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異分母分數減法
兩組對邊相等和有直角的四邊形
四邊形的特性
GeoGebra笔记功能体验课件
找出對稱軸
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變色孔雀
第一本
Ex5D#6
Triangle
必修二P156二面角与平面的法向量
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Natural Numbers
Set Theory
Differential Calculus
Division
Frequency Distribution