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初三奥赛：圆的切割线问题
Author:
王俊辉
拖动点P，或点D，改变其位置，探究点F的轨迹。
GeoGebra
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算柱 (兩位數)
【案例】圆柱体内放置一个大球六个小球
兩位數除以一位數（一）
找出對稱軸
判斷球體
Discover Resources
z=x^2-y^2
基本檔
angle
二維序列物件
密鋪5
Discover Topics
Continuity
Triangles
Straight Lines
Linear Regression
Subtraction