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圆锥曲线的统一定义（第二定义）
Author:
少平 朱
GeoGebra
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兩組對邊相等的四邊形
異分母分數減法
柱體建築師
兩位數加法
兩位數除以一位數（一）
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waaachen
對數圖形的平移
ex 9
圓所形成的三角形
基础知识
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Secant Line or Secant
Quadrilaterals
Linear Functions
Intersection
Vectors