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足迹
Author:
孟宝兴
足迹
GeoGebra
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【案例】2018年全国1卷理科12题
兩位數除以一位數（二）
兩位數加法
球体的体积推导（优化版）
判斷球體
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Dilation of area
軌跡,摺紙,滾動,實驗觀察,曲線
碎形三角形
Copy of 周界
正方形
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Kite
Multiplication
Congruence
Cone
Geometric Mean