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I love you
Author:
李春培
I love you
GeoGebra
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三位數除以一位數（二）
三位數除以一位數（一）
兩位數加法
異分母分數減法
【案例】2013年安徽高考15题
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Erdos-Mordell 不等式
triangle
test
S1 Ex9Re Q24
大小相同串珠
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Tree Diagrams
Median Value
Real Numbers
Cone
Sequences and Series