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Author:
李春培
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GeoGebra
New Resources
近似值：有效數字
兩組對邊相等和有直角的四邊形
Earth with coastline
第八周作业
找出對稱軸
Discover Resources
利用文字工具顯示計算結果
利用对称求线段和最值（移动端）
面外一點
功課
兩圓位置關係與公切線
Discover Topics
Trigonometry
Root
Exponential Functions
Pyramid
Surface