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变形树
Author:
rpxm
GeoGebra
New Resources
圓的切線方程
圓周公式的應用
祖冲之的期望:内棋与外棋
圓的基本性質
平行線的判定
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测试
locus wrt two pts on two indep. circle
正四面体分形
小四平面圖形學習單
拋物線