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Apollonius Problem poncelet fouche
Author:
tkyggb
GeoGebra
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兩位數加法
【案例】2018年全国1卷理科12题
兩位數除以一位數（二）
拼砌四邊形
算柱 (兩位數)
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平面鏡成像 Image of Plane Mirror Reflection
三角函數
歐拉圓
抛物线中与三角形重心有关的轨迹.许兴华数学
勾股定理：射影无字证明
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Coordinates
Distributions
Prism
Continuity
Percentages