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正九邊形
Author:
李春培
正九邊形
GeoGebra
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拼砌四邊形
兩組對邊相等和有直角的四邊形
三位數除以一位數（二）
【案例】2018年全国1卷理科12题
找出對稱軸
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折扣 例4
向量分解：解聯立
勝者即正義，可愛即正義～(可用Ctrl+滑鼠滾輪放大界面)
Tetrahedron 四面體
Parallelogram
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Parabola
Trigonometry
Geometric Transformations
Solids or 3D Shapes
Similar Triangles