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Author:
沈先生
GeoGebra
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Nested spiral octagon
直角坐標平面上的旋轉變換
Fibonacci Clock
兩組對邊相等的四邊形
畫出對稱圖形
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複合圖形(一)
Copy of 20151104 四邊形 P2
求二次函数f(x)=-x^2+ax+3区间[-2,3]上的最大值
根據百分率找數量（二）: 例1的副本
i love you的副本
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Coordinates
Means
Isosceles Triangles
Constructions
Limits