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畢氏定理
Author:
葉千岱
GeoGebra
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四邊形的特性
兩位數除以一位數（二）
畫出對稱圖形
【案例】圆柱体内放置一个大球六个小球
判斷球體
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proof10 曹詠鈞
Möbius strip
三角函數 週期、振幅變化
橢圓3--平行四邊形法
趣味数学
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Sine
Ratios
Optimization Problems
Quadratic Equations
Mathematics