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诱导公式四（原点对称关系）
Author:
桃篮翁
GeoGebra
New Resources
三位數除以一位數（一）
近似值：有效數字
判斷球體
畫出對稱圖形
找出對稱軸
Discover Resources
Quiz on Addition and Subtraction of Directed Numbers (2) 有向數加減測驗(2)
方輪與方路
擴分、約分及比較大小
hint
圖形的內部、外部與周界
Discover Topics
Scalene Triangles
Interest Calculation
Plane Figures or Shapes
Histogram
Linear Equations