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符成岗
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符成岗
GeoGebra
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三位數除以一位數（一）
球体的体积推导
球體建築師
【案例】2013年安徽高考15题
第八周作业
Discover Resources
藝術
parallelogram
Homework6
三角形，點上平分面積
劉徽的「割圓術」的副本
Discover Topics
Symmetry
Scalene Triangles
Reflection
Addition
Dilation