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quadrilaterals 1
Author:
iedc
GeoGebra
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拼砌四邊形
兩位數除以一位數(二)
異分母分數減法
画直线等分三角形的面积
GeoGebra笔记功能体验课件
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兩圓的位置關係
ppppp
謝爾賓斯基三角形(Sierpinsky)
圆的面积 - 洋葱法
折纸角度探究2
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Means
Ellipse
Quadratic Equations
Reflection
Ratios