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d2j
Author:
杜耀宗
GeoGebra
New Resources
龙形曲线-分形龙2
折扣
科赫雪花
平行線的判定
撒针估算面积实验
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HKCEE-AM 2006 Q17
圖形的周界
椭圆的中点弦的轨迹.许兴华数学
开关灯游戏 5×3
一半模型归纳
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Algebra
Geometric Distribution
Rhombus
General Quadrilateral
Cylinder