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重难题组周练（1）——二次函数
Author:
程洁
Topic:
Quadratic Functions
GeoGebra
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兩組對邊相等和有直角的四邊形
拼砌四邊形
画直线等分三角形的面积
直角坐標平面上的旋轉變換
柱體建築師
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莫雷角三分線定理
垂心(劉虹圻623)
拋物線1-焦點法
Magic Matches
奥倍尔定理
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Diagrams
Complex Numbers
Congruence
Fractal Geometry
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