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直线与椭圆
Author:
lidonglin
焦点到直线的距离之积为定值b方则直线与椭圆相切
GeoGebra
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常见四边形是否是双心四边形
直線的斜率:水平變化 & 鉛垂變化
圓的基本性質
龙形曲线-分形龙2
圓周公式的應用
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龍騰4_1-1課例2
題A至E
小棒
完整地球儀
旋轉正方形
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Dilation
Division
Right Triangles
Mode
Fractions