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三垂線
Author:
Wu Xiao-Ren
GeoGebra
New Resources
兩位數除以一位數（二）
兩位數加法
三位數除以一位數（二）
兩位數除以一位數（一）
【案例】圆柱体内放置一个大球六个小球
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例題6
Angle at Centre & Angle at Circumference: Proof 圓心角與圓周角：証明
HKMO 2013 Question 3 Demonstration (Geometric Construction)
水波干涉
任意四边形各边中点的连线必构成平行四边形.许兴华数学
Discover Topics
Definite Integral
Derivative
Root
Division
Tangent Line or Tangent