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平行線的斜率
垂直線的斜率
多邊形的面積
漂亮的摇摆曲线
第八周作业
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GGB動畫-會有圖案
畢氏定理證明
褶正三角形
均值不等式的一种几何证明.许兴华数学
原點對稱1
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Constructions
General Quadrilateral
Mathematics
Polygons
Solids or 3D Shapes