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Author:
Jianqiang He
GeoGebra
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三位數除以一位數（一）
圓周公式的應用
第八周作业
兩位數加法
祖冲之的期望：内棋与外棋
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相切的三圓
Euler line 2
Measure of Dispersion
力的合成
閱讀量杯
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Mathematics
Variance
Binomial Distribution
Constructions
Line Segment