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勾股定理的证明:弦图面积平移法
Author:
李洋
GeoGebra
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常见四边形是否是双心四边形
比較五件物件的重量
百分數及其應用
平行線的判定
正方形雪花图案
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rabbit
兩面角
小圓內繞大圓
linkage
Ellipse_Vertical
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Functions
Statistical Characteristics
Arithmetic
Straight Lines
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