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救生員區域
Author:
張丰耘
GeoGebra
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兩組對邊相等的四邊形
異分母分數減法
球體建築師
三位數除以一位數（一）
近似值：有效數字
Discover Resources
http://www.qsir.org/?p=8853
圓錐曲線與平行四邊形定理
畢氏定理(遮蔽法)
保持比例
畢氏定理的副本
Discover Topics
Secant Line or Secant
Parabola
Ratios
Special Points
Tangent Function