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诱导公式四（原点对称关系）
Author:
桃篮翁
GeoGebra
New Resources
球體建築師
柱體建築師
兩組對邊相等和有直角的四邊形
拼砌四邊形
算柱 (兩位數)
Discover Resources
i love you
拋物線
松菸巨蛋談判工作表
周界-平移法(練習四)
複合棒形圖
Discover Topics
Special Points
Linear Regression
Parametric Curves
Parabola
Combinatorics