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正四面體
Author:
侯杰材
正四面體
GeoGebra
New Resources
錐體建築師
球体的体积推导（优化版）
兩組對邊相等的四邊形
【案例】2013年安徽高考15题
兩位數加法
Discover Resources
閱讀鐘面及數字鐘（時和分）
掃描不等式圖形
Product_TEST_01
雙曲線的平移
homework
Discover Topics
Difference and Slope
Solids or 3D Shapes
Function Graph
Rotation
Numbers