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三角形外心的角度關係
Author:
均一
GeoGebra
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兩組對邊相等的四邊形
【案例】圆柱体内放置一个大球六个小球
兩位數加法
兩位數除以一位數（二）
三位數除以一位數（一）
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一元一次方程式
PMC 2014-15 Q5
指數1209
Measuring areas by placing different shapes
賺賠：例3的副本
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Quadratic Functions
Derivative
Numbers
Differential Equation
Perimeter