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四直角
Author:
凡修 孟
GeoGebra
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直線的斜率
探究三角形的全等條件
三角函数 的副本
常见四边形是否是双心四边形
多邊形的面積
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拋物線作圖Ex1
垂直2
DSE Circle-ACT03B Relationship Between Chords and Angles at Centre
人教版必修I函数表示P21例5
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