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正20面體展開
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GEOGEBRA啟
GeoGebra
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【案例】2013年安徽高考15题
球体的体积推导（优化版）
兩位數加法
兩位數除以一位數（二）
第八周作业
Discover Resources
t6 geobra
堆疊(圓、正方形、正三角形)
(004)80201辛宇婕
GGB3
拼貼11939
Discover Topics
Cosine
Natural Numbers
Linear Programming or Linear Optimization
Reflection
Geometric Mean