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GeoGebra
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兩組對邊相等的四邊形
近似值:有效數字
四邊形的特性
Nested spiral octagon
兩組對邊相等和有直角的四邊形
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判斷線型函數y=f(x)=ax+b的b值
簡易統計
角度比較
中間人
正12面體
拋物線
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Cylinder
Multiplication
Rational Numbers
Polygons
Cone