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GeoGebra
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正方形雪花图案
撒针估算面积实验
第八周作业3
中华人民共和国国旗
折扣
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佑玟ggb book
分解三棱柱
麻之葉
根據百分率找數量（一）:例1的副本
圆与直线的位置关系
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General Quadrilateral
Plane Figures or Shapes
Integral Calculus
Circle
Vectors