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Author:
赵林
GeoGebra
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直角坐標平面上的旋轉變換
球體建築師
兩組對邊相等和有直角的四邊形
兩位數加法
【案例】圆柱体内放置一个大球六个小球
Discover Resources
正立方體展開動畫
體積
Question 8
shuangquxian
俄罗斯方块（第二版）
Discover Topics
Inequalities
Cuboid
Normal Distribution
Incircle or Inscribed Circle
Perimeter