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定长线段在相交直线上滑动
Author:
冯伟冀
GeoGebra
New Resources
龙形曲线-分形龙2
龙形曲线-分形龙
常见四边形是否是双心四边形
第八周作业2
盈利與虧蝕
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正方體的反射對稱1
時間參數跳躍函數
圓形墊圈 (Washer) 2
堆疊正立方體的副本
C60足球模型展开（单色版）
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Derivative
Orthocenter
Percentages
Distributions
Limits