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cherry910502
GeoGebra
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算柱 (兩位數)
拼砌四邊形
【案例】2013年安徽高考15题
三位數除以一位數（二）
兩位數除以一位數（一）
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三個外切圓
Box method for multiplication
MFS Pyth Thm 2
Centres
求切线方程(改进)
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Dilation
Trigonometric Functions
Combinatorics
Integers
Hypergeometric Distribution