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中心对称图形
Author:
宋晓燕
GeoGebra
New Resources
找出對稱軸
異分母分數減法
四邊形的特性
三位數除以一位數（一）
近似值：有效數字
Discover Resources
畫三角形 題2d
circle
(001)80102史巧薇
正n邊形
earth
Discover Topics
Angles
Similarity Transformation or Similarity
Arithmetic Mean
Secant Line or Secant
Polygons