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勾股定理的毕氏证明（吴兴海)
Author:
吴兴海
GeoGebra
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三位數除以一位數（二）
兩組對邊相等的四邊形
【案例】2018年全国1卷理科12题
畫出對稱圖形
【案例】圆柱体内放置一个大球六个小球
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平方差
多重指令
畫鐘面的副本
外心
橢圓規Ellipsograph of Parallelogram
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Means
Planes
Distributions
Multiplication
Equations