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animation for kastin
Author:
yoyowinwin_1
This is Wayne , from
bbs.emath.ac.cn
GeoGebra
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兩組對邊相等和有直角的四邊形
【案例】2018年全国1卷理科12题
兩位數加法
異分母分數減法
兩位數除以一位數（二）
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交點軌跡動態
橢圓
動國旗
軌跡方程式-重心軌跡
各種切圓
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Combinatorics
Median Value
Angles
Sine
Diagrams