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函數圖形的變化（Ⅰ）
Autor:
卜扬帆
GeoGebra
Nuevos recursos
正方形雪花图案
撒针估算面积实验
第八周作业3
常见四边形是否是双心四边形
第八周作业2
Descubrir recursos
Relationships between chords and their distances from centre
鉛筆畫圓
圓周 (圖形E)
[S2] a revised version of Jane’s GeoGebra file (modified by the author)
正方形纸片剪出正三角形（顶点在边上）
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Histograma
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