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预测二，25
Author:
夜雨嘀嗒
GeoGebra
New Resources
科赫雪花
异形操场
常见四边形是否是双心四边形
圓的切線方程
撒针估算面积实验
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題 7
繪製線型函數圖形
Addition of 3 Directed Numbers
優良作品1(孟倫)
摺正三角形
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Constructions
Mode
Percentages
Optimization Problems
Polygons