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Author:
luodeqin@keleshuxue.com
GeoGebra
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兩組對邊相等和有直角的四邊形
第八周作业
四邊形的特性
異分母分數減法
画直线等分三角形的面积
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waaachen
翰林B4講p192-例1
人教版必修I函数表示P21例5
正方形堆垛
圓的面積的副本
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Functions
Exponent
Integral Calculus
Addition
Interest Calculation