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Chen, shih-hsiung
GeoGebra
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球體建築師
兩位數除以一位數（一）
【案例】2013年安徽高考15题
兩位數除以一位數（二）
算柱 (兩位數)
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百分數（小學）：折扣 / 賺賠（Java 版）
有趣的切圓
約分
Problem1:(md+me+mf)/(ad+be+cf)=a
S2 ch2.3 simultaneous equation
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Functions
Numbers
Combinatorics
Linear Programming or Linear Optimization
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