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椭圆画法1--参数方程法
Author:
冯伟冀
GeoGebra
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三位數除以一位數（一）
異分母分數減法
三位數除以一位數（二）
兩組對邊相等的四邊形
判斷球體
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双曲线
繡曲線
Space-filling curve
雙曲線2--焦點法
Pyth. theorem
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Hyperbola
Expected Value
Square
Boxplot
Sphere