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圓心至弦的垂線平分弦
Author:
Sam
GeoGebra
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拼砌四邊形
第八周作业
近似值：有效數字
判斷球體
球體建築師
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soccer
判斷線型函數y=f(x)=ax+b的a值(隨機出題)
蜘蛛網
阿波羅圓
勾股定理的直观证明（义务教育数学 新课标-例82）
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Geometry
Matrices
Constructions
Surface
Piecewise Functions