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Author:
chen mingchuan
GeoGebra
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sanjiaohanshu
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
拼砌四邊形
兩位數除以一位數（二）
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分數加法和減法
Apollonius Problem gergonne 2
禪繞畫
EnergyMath 2-3 棣美弗定理的副本
任意四边形各边中点的连线必构成平行四边形.许兴华数学
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Tangent Function
Integers
Functions
Arithmetic Mean
Pie Chart or Circle Chart